diff --git a/book/_toc.yml b/book/_toc.yml
index 393c431..fa770a6 100644
--- a/book/_toc.yml
+++ b/book/_toc.yml
@@ -126,6 +126,12 @@ parts:
       title: "Example of buggy code"
     - url: https://classroom.github.com/a/KAk_xxph
       title: "FixMe. Midterm 2"
+    - url: https://classroom.github.com/a/McjRehT6
+      title: "Knowledge Test 1"
+    - url: https://classroom.github.com/a/gseTkT5p
+      title: "Knowledge Test 2"
+    - url: https://classroom.github.com/a/pf4re3Xy
+      title: "Knowledge Test 3"
 
   - caption: Contributing and Using
     chapters: