u/Dry_Newspaper_7542

am trying to register for a class (math115b) because i am failing it right now and i want to take it again next year but i cant enroll only add to cart. i dropped the class i was going to take after (math 135) because i was like oh ima fail 115b so i need to do 115b again but now that i realized i cant enroll im stuck at only 3 classes in my schedule. is there enrollment in the future like during summer or what can i do