Maths Del Problem

[manaschubby]

Number of disciplinary electives shown for B4 (Mathematics) are shown to be 4 (12 credits) whereas they should be 5 (15 credits).
Please fix it

[saiankit]

Please look at https://github.com/saiankit/cgpacalculator/blob/master/lib/data/courses_data.dart and update the courses accordingly if possible.