hey,

i hope you are doing well

see if we talk about seats for the course B.Sc hons mathematics then every college ode delhi university do have different number of seats and it is reallyvery difficult for us to mention the seats of every college as we know there are lots of colleges of delhi university , however for your help here i am mentioning a link by clicking on that you will get to know about seats of every college

https://university.careers360.com/articles/du-seats

the last date to fill the application form of delhi university for all the under graduate and post graduates courses is 31 august (extended)

https://university.careers360.com/articles/du-admission

and fee structure varies college to college and year to year

hope this helps!