lets do one thing. remove the addclasses and manage classes options. totally. we'll just add a "choose section" button and the student would choose "BSCE-1B" and all the classes with the batch: "BSCE-1B"

example json of a class

(
_id68b74174f838a20a114a1d1bday"Monday"subject"IST BSCE-1B + BSEE-1C"instructor"Dr. Shahzad Shaikh"room"C-14 Academic Block II (50)"startTime"08:55"endTime"09:45"batch"BSCE-1B"type"lecture")

every class of bcse 1b will show. that will make it simpler. and better.
add 2 sections

bsce 1b and bsce 1a