diff --git a/client/gatsby-node.js b/client/gatsby-node.js
index 1ff2ba48ee6..5b72129beca 100644
--- a/client/gatsby-node.js
+++ b/client/gatsby-node.js
@@ -85,6 +85,10 @@ exports.createPages = function createPages({ graphql, actions, reporter }) {
                   hasEditableBoundaries
                   id
                   order
+                  prerequisites {
+                    id
+                    title
+                  }
                   required {
                     link
                     src
@@ -284,6 +288,7 @@ exports.createSchemaCustomization = ({ actions }) => {
       notes: String
       url: String
       assignments: [String]
+      prerequisites: [PrerequisiteChallenge]
     }
     type FileContents {
       fileKey: String
@@ -294,6 +299,10 @@ exports.createSchemaCustomization = ({ actions }) => {
       tail: String
       editableRegionBoundaries: [Int]
     }
+    type PrerequisiteChallenge {
+      id: String
+      title: String
+    }
   `;
   createTypes(typeDefs);
 };
diff --git a/client/i18n/locales/english/intro.json b/client/i18n/locales/english/intro.json
index 8f26c287a54..bde5a87379a 100644
--- a/client/i18n/locales/english/intro.json
+++ b/client/i18n/locales/english/intro.json
@@ -1011,6 +1011,7 @@
       "Through hands-on exercises and projects, you will learn the fundamentals of C#, including variables, data types, control structures, and object-oriented programming principles.",
       "By the end of this course, you will have gained the practical skills and knowledge needed to confidently leverage C# for building robust and scalable applications"
     ],
+    "note": "Note: You must complete the trophy challenge in each section below to qualify for the certification exam.",
     "blocks": {
       "write-your-first-code-using-c-sharp": {
         "title": "Write Your First Code Using C#",
diff --git a/client/i18n/locales/english/translations.json b/client/i18n/locales/english/translations.json
index 3078971abb1..cb7235a58de 100644
--- a/client/i18n/locales/english/translations.json
+++ b/client/i18n/locales/english/translations.json
@@ -402,7 +402,9 @@
     "season-greetings-fcc": "Season's Greetings from the freeCodeCamp community 🎉",
     "if-getting-value": "If you're getting a lot out of freeCodeCamp, now is a great time to donate to support our charity's mission.",
     "building-a-university": "We're Building a Free Computer Science University Degree Program",
-    "if-help-university": "We've already made a ton of progress. Support our charity with the long road ahead."
+    "if-help-university": "We've already made a ton of progress. Support our charity with the long road ahead.",
+    "qualified-for-exam": "Congratulations, you have completed all the requirements to qualify for the exam.",
+    "not-qualified-for-exam": "You have not met the requirements to be eligible for the exam. To qualify, please complete the following challenges:"
   },
   "donate": {
     "title": "Support our charity",
diff --git a/client/src/redux/prop-types.ts b/client/src/redux/prop-types.ts
index 565102b59bb..fc109541aed 100644
--- a/client/src/redux/prop-types.ts
+++ b/client/src/redux/prop-types.ts
@@ -71,6 +71,11 @@ export interface VideoLocaleIds {
   portuguese?: string;
 }
 
+export interface PrerequisiteChallenge {
+  id: string;
+  title: string;
+}
+
 export type ChallengeWithCompletedNode = {
   block: string;
   challengeType: number;
@@ -114,6 +119,7 @@ export type ChallengeNode = {
       type: string;
     };
     notes: string;
+    prerequisites: PrerequisiteChallenge[];
     removeComments: boolean;
     isLocked: boolean;
     isPrivate: boolean;
diff --git a/client/src/templates/Challenges/exam/show.tsx b/client/src/templates/Challenges/exam/show.tsx
index 2e20d13adc9..d062176a338 100644
--- a/client/src/templates/Challenges/exam/show.tsx
+++ b/client/src/templates/Challenges/exam/show.tsx
@@ -1,5 +1,5 @@
 // Package Utilities
-import { Grid, Col, Row, Button } from '@freecodecamp/react-bootstrap';
+import { Alert, Grid, Col, Row, Button } from '@freecodecamp/react-bootstrap';
 import { graphql } from 'gatsby';
 import React, { Component, RefObject } from 'react';
 import Helmet from 'react-helmet';
@@ -21,7 +21,6 @@ import Hotkeys from '../components/hotkeys';
 import { startExam, stopExam } from '../../../redux/actions';
 import {
   completedChallengesSelector,
-  partiallyCompletedChallengesSelector,
   isSignedInSelector,
   examInProgressSelector
 } from '../../../redux/selectors';
@@ -51,19 +50,16 @@ const mapStateToProps = createSelector(
   completedChallengesSelector,
   isChallengeCompletedSelector,
   isSignedInSelector,
-  partiallyCompletedChallengesSelector,
   examInProgressSelector,
   (
     completedChallenges: CompletedChallenge[],
     isChallengeCompleted: boolean,
     isSignedIn: boolean,
-    partiallyCompletedChallenges: CompletedChallenge[],
     examInProgress: boolean
   ) => ({
     completedChallenges,
     isChallengeCompleted,
     isSignedIn,
-    partiallyCompletedChallenges,
     examInProgress
   })
 );
@@ -369,9 +365,9 @@ class ShowExam extends Component<ShowExamProps, ShowExamState> {
     });
 
     this.timerInterval = setInterval(() => {
-      this.setState({
-        examTimeInSeconds: this.state.examTimeInSeconds + 1
-      });
+      this.setState(state => ({
+        examTimeInSeconds: state.examTimeInSeconds + 1
+      }));
     }, 1000);
 
     this.setState(
@@ -462,6 +458,7 @@ class ShowExam extends Component<ShowExamProps, ShowExamState> {
             description,
             fields: { blockName },
             instructions,
+            prerequisites,
             superBlock,
             title,
             translationPending
@@ -469,6 +466,7 @@ class ShowExam extends Component<ShowExamProps, ShowExamState> {
         }
       },
       examInProgress,
+      completedChallenges,
       isChallengeCompleted,
       openFinishExamModal,
       pageContext: {
@@ -485,6 +483,13 @@ class ShowExam extends Component<ShowExamProps, ShowExamState> {
       showResults
     } = this.state;
 
+    const missingPrequisites = prerequisites.filter(
+      prerequisite =>
+        !completedChallenges.find(({ id }) => prerequisite.id === id)
+    );
+
+    const qualifiedForExam = missingPrequisites.length === 0;
+
     const blockNameTitle = `${t(
       `intro:${superBlock}.blocks.${block}.title`
     )}: ${title}`;
@@ -613,6 +618,23 @@ class ShowExam extends Component<ShowExamProps, ShowExamState> {
                   {title}
                 </ChallengeTitle>
                 <Spacer size='medium' />
+
+                {qualifiedForExam ? (
+                  <Alert id='qualified-for-exam' bsStyle='info'>
+                    <p>{t('learn.qualified-for-exam')}</p>
+                  </Alert>
+                ) : (
+                  <Alert id='not-qualified-for-exam' bsStyle='danger'>
+                    <p>{t('learn.not-qualified-for-exam')}</p>
+                    <Spacer size='small' />
+                    <ul>
+                      {missingPrequisites.map(({ title, id }) => (
+                        <li key={id}>{title}</li>
+                      ))}
+                    </ul>
+                  </Alert>
+                )}
+
                 <PrismFormatted text={description} />
                 <Spacer size='medium' />
                 <PrismFormatted text={instructions} />
@@ -621,6 +643,7 @@ class ShowExam extends Component<ShowExamProps, ShowExamState> {
                   block={true}
                   bsStyle='primary'
                   data-cy='start-exam'
+                  disabled={!qualifiedForExam}
                   onClick={this.runExam}
                 >
                   {t('buttons.click-start-exam')}
@@ -648,6 +671,7 @@ export const query = graphql`
   query ExamChallenge($slug: String!) {
     challengeNode(challenge: { fields: { slug: { eq: $slug } } }) {
       challenge {
+        block
         challengeType
         description
         fields {
@@ -656,6 +680,10 @@ export const query = graphql`
         helpCategory
         id
         instructions
+        prerequisites {
+          id
+          title
+        }
         superBlock
         title
         translationPending
diff --git a/curriculum/challenges/english/19-foundational-c-sharp-with-microsoft/foundational-c-sharp-with-microsoft-certification-exam/foundational-c-sharp-with-microsoft-certification-exam.md b/curriculum/challenges/english/19-foundational-c-sharp-with-microsoft/foundational-c-sharp-with-microsoft-certification-exam/foundational-c-sharp-with-microsoft-certification-exam.md
index 21ac654ec6d..54119ff1976 100644
--- a/curriculum/challenges/english/19-foundational-c-sharp-with-microsoft/foundational-c-sharp-with-microsoft-certification-exam/foundational-c-sharp-with-microsoft-certification-exam.md
+++ b/curriculum/challenges/english/19-foundational-c-sharp-with-microsoft/foundational-c-sharp-with-microsoft-certification-exam/foundational-c-sharp-with-microsoft-certification-exam.md
@@ -3,6 +3,19 @@ id: 647e22d18acb466c97ccbef8
 title: Foundational C# with Microsoft Certification Exam
 challengeType: 17
 dashedName: foundational-c-sharp-with-microsoft-certification-exam
+prerequisites:
+  - id: 647f85d407d29547b3bee1bb
+    title: Trophy - Write Your First Code Using C#
+  - id: 647f87dc07d29547b3bee1bf
+    title: Trophy - Create and Run Simple C# Console Applications
+  - id: 647f882207d29547b3bee1c0
+    title: Trophy - Add Logic to C# Console Applications
+  - id: 647f867a07d29547b3bee1bc
+    title: Trophy - Work with Variable Data in C# Console Applications
+  - id: 647f877f07d29547b3bee1be
+    title: Trophy - Create Methods in C# Console Applications
+  - id: 647f86ff07d29547b3bee1bd
+    title: Trophy - Debug C# Console Applications
 ---
 
 # --description--
diff --git a/curriculum/schema/challenge-schema.js b/curriculum/schema/challenge-schema.js
index 7d3a395c325..2b918533bc5 100644
--- a/curriculum/schema/challenge-schema.js
+++ b/curriculum/schema/challenge-schema.js
@@ -21,6 +21,11 @@ const fileJoi = Joi.object().keys({
   history: Joi.array().items(Joi.string().allow(''))
 });
 
+const prerequisitesJoi = Joi.object().keys({
+  id: Joi.objectId().required(),
+  title: Joi.string().required()
+});
+
 const schema = Joi.object()
   .keys({
     block: Joi.string().regex(slugRE).required(),
@@ -55,6 +60,10 @@ const schema = Joi.object()
     isPrivate: Joi.bool(),
     notes: Joi.string().allow(''),
     order: Joi.number(),
+    prerequisites: Joi.when('challengeType', {
+      is: [challengeTypes.exam],
+      then: Joi.array().items(prerequisitesJoi)
+    }),
     // video challenges only:
     videoId: Joi.when('challengeType', {
       is: challengeTypes.video,