Admission to the CS major needs a 3.30 GPA in CS 61A, 61B, 70, using only grades earned at Berkeley.
http://www.eecs.berkeley.edu/csugrad/#petitioning
More time consuming courses are typically those with labs, art studio, or music performance, or those with large term projects, or those with computer programming assignments (e.g. CS 61A, 61B).