What is the difficulty of changing my major to computer science?

2.0 average GPA or above in ICS/CSE 21 and 22 or Informatics 41 and 42, or ICS 31 and 32; and one of the following: Math 2A, Math 2B, ICS 6B/Math 6B or ICS 6D/Math 6D.

I was accepted in my backup major and ended up in my first major after finishing the courses I needed, if you meet those requirements it’s a guarantee UNLESS you go above 135 units before you get to that point. (it still might be possible, but they review applications of seniors to make sure you can graduate on time.)