diff --git a/README.md b/README.md
index 29141d8..e06faf6 100644
--- a/README.md
+++ b/README.md
@@ -66,6 +66,8 @@ Purchase a PDF on Kindle and adjust your region settings for the most favorable
 
 Purchase a PDF on **Google Play Book**: [AWS Cloud Practitioner Study Notes PDF](https://play.google.com/store/books/details?id=A4rSEAAAQBAJ)
 
+Purchase a PDF on **Leanpub**: [AWS Cloud Practitioner Study Notes (CLF-C02) PDF](https://leanpub.com/aws-cloud-practitioner-study-notes)
+
 ## Other AWS And Azure Certification Notes
 
 - [AWS Developer Associate (DVA-C02)](https://certification.kananinirav.com/aws-developer-associate/)
diff --git a/practice-exam/practice-exam-10.md b/practice-exam/practice-exam-10.md
index 78f5103..9834c12 100644
--- a/practice-exam/practice-exam-10.md
+++ b/practice-exam/practice-exam-10.md
@@ -448,13 +448,13 @@ If this practice exam has been helpful to you please share it with others and re
     </details>
 
 44. Which AWS service can be used to automatically scale an application up and down without making capacity planning decisions?
-    - A. Amazon EBS.
+    - A. Amazon AutoScaling.
     - B. Amazon Redshift.
     - C. AWS CloudTrail.
     - D. AWS Lambda.
 
     <details markdown=1><summary markdown='span'>Answer</summary>
-      Correct answer: D
+      Correct answer: A
     </details>
 
 45. Amazon Relational Database Service (Amazon RDS) offers which of the following benefits over traditional database management?
diff --git a/practice-exam/practice-exam-13.md b/practice-exam/practice-exam-13.md
index 56b00fa..18603d2 100644
--- a/practice-exam/practice-exam-13.md
+++ b/practice-exam/practice-exam-13.md
@@ -162,7 +162,7 @@ If this practice exam has been helpful to you please share it with others and re
 
     <details markdown=1><summary markdown="span">Answer</summary>
 
-    Correct Answer: AE
+    Correct Answer: AB
 
     Explanation:
     - <https://aws.amazon.com/cloudwatch/>
diff --git a/practice-exam/practice-exam-14.md b/practice-exam/practice-exam-14.md
index a92f178..b9be9e1 100644
--- a/practice-exam/practice-exam-14.md
+++ b/practice-exam/practice-exam-14.md
@@ -551,7 +551,7 @@ If this practice exam has been helpful to you please share it with others and re
 
     <details markdown=1><summary markdown="span">Answer</summary>
 
-    Correct Answer: B
+    Correct Answer: D
 
     Explanation:
     - AWS customers are welcome to carry out security assessments or penetration tests against their AWS infrastructure without prior approval for 8 services.
diff --git a/practice-exam/practice-exam-15.md b/practice-exam/practice-exam-15.md
index b856788..ef807ed 100644
--- a/practice-exam/practice-exam-15.md
+++ b/practice-exam/practice-exam-15.md
@@ -556,7 +556,7 @@ If this practice exam has been helpful to you please share it with others and re
 
     <details markdown=1><summary markdown="span">Answer</summary>
 
-    Correct Answer: D
+    Correct Answer: C
 
     Explanation:
 
diff --git a/practice-exam/practice-exam-2.md b/practice-exam/practice-exam-2.md
index da58c78..0cc9699 100644
--- a/practice-exam/practice-exam-2.md
+++ b/practice-exam/practice-exam-2.md
@@ -340,7 +340,7 @@ If this practice exam has been helpful to you please share it with others and re
     - E. Dedicated hosting.
 
     <details markdown=1><summary markdown='span'>Answer</summary>
-      Correct answer: C, D
+      Correct answer: B, C
     </details>
 
 34. Which of the following aspects of security are managed by AWS? (Choose TWO)
diff --git a/practice-exam/practice-exam-20.md b/practice-exam/practice-exam-20.md
index b988e5b..a37a801 100644
--- a/practice-exam/practice-exam-20.md
+++ b/practice-exam/practice-exam-20.md
@@ -214,7 +214,7 @@ If this practice exam has been helpful to you please share it with others and re
 
     <details markdown=1><summary markdown="span">Answer</summary>
 
-    Correct Answer: C
+    Correct Answer: B
 
     Explanation: <https://docs.aws.amazon.com/organizations/latest/userguide/orgs_manage_accounts.html>
 
diff --git a/practice-exam/practice-exam-23.md b/practice-exam/practice-exam-23.md
index 65bfd4a..b519d56 100644
--- a/practice-exam/practice-exam-23.md
+++ b/practice-exam/practice-exam-23.md
@@ -604,7 +604,7 @@ If this practice exam has been helpful to you please share it with others and re
 
     <details markdown=1><summary markdown="span">Answer</summary>
 
-    Correct Answer: B
+    Correct Answer: A
 
     Explanation: <https://aws.amazon.com/ec2/faqs/>
 
diff --git a/practice-exam/practice-exam-8.md b/practice-exam/practice-exam-8.md
index a2fdb3c..8127596 100644
--- a/practice-exam/practice-exam-8.md
+++ b/practice-exam/practice-exam-8.md
@@ -292,7 +292,7 @@ If this practice exam has been helpful to you please share it with others and re
     - E. Provides software solutions that run on AWS or any other Cloud vendor.
 
     <details markdown=1><summary markdown='span'>Answer</summary>
-      Correct answer: A, D
+      Correct answer: D, E
     </details>
 
 29. What is the benefit of Amazon EBS volumes being automatically replicated within the same availability zone?