diff --git a/docs/数据结构与算法/CS61B.md b/docs/数据结构与算法/CS61B.md
index 43400b8a..3460721a 100644
--- a/docs/数据结构与算法/CS61B.md
+++ b/docs/数据结构与算法/CS61B.md
@@ -39,9 +39,9 @@ COS226 Fall 2011 Midterm Solution: https://www.cs.princeton.edu/courses/archive/
 COS226 Spring 2012 Midterm Solution: https://www.cs.princeton.edu/courses/archive/spring15/cos226/exams/mid-s12-sol.pdf  
 COS226 Fall 2012 Midterm Solution: https://www.cs.princeton.edu/courses/archive/spring15/cos226/exams/mid-f12-sol.pdf  
 COS226 Spring 2013 Midterm Solution: https://www.cs.princeton.edu/courses/archive/fall13/cos226/exams/mid-s13-sol.pdf  
-CS61B Fall 2014 Test Solutions (Final, Final2, final3, Midterm, Midterm2): https://inst.eecs.berkeley.edu/~cs61b/fa14/test-solutions/  
+CS61B Fall 2014 Test Solutions (Final, Final2, Final3, Midterm, Midterm2): https://inst.eecs.berkeley.edu/~cs61b/fa14/test-solutions/  
 CS61B Spring 2016 Midterm2 Walkthrough: https://www.youtube.com/watch?v=rciRgoiJVGY  
 CS61B Spring 2017 Midterm2 Walkthrough: https://www.youtube.com/channel/UCqiudaLea8HNE23GBC34R5Q/videos  
-CS61B Spring 2016 MT1, Spring 2017 Exam Prep, Spring 2018 MT1, Spring 2019 MT1, Spring 2019 MT2, CS61B Fall 2020 MT1: https://www.youtube.com/channel/UCNBSbBTFx8nFahcQyZOYOgQ/videos  
+CS61B Spring 2016 MT1, Spring 2017 Exam Prep, Spring 2018 MT1, Spring 2019 MT1, Spring 2019 MT2, Fall 2020 MT1: https://www.youtube.com/channel/UCNBSbBTFx8nFahcQyZOYOgQ/videos  
 CS61B Spring 2019 Discussion: https://www.youtube.com/channel/UCdh0Rpk6C1w1ypiEjjKh_Uw/videos  
 CS61B Fall 2020 Discussion: https://www.youtube.com/channel/UCtic6FhXmfR0PSntIXjhwaw/videos