<p>At calso the counselor said to email her if we wanted to make any changes to our classes. I emailed her today but i got a reply that she is on vacation till August 14th. Do I really have to email my counselor before i can sign up for different classes. I was also wondering how much experience or what i should know before going into cs61a. I dont think skipping cs61a for e77 is a good idea because cs61a seems so important.</p>