Hey,
The. Bachelor of Science is a three years long undergraduate programme that is offered in various courses. The basic eligibility criteria is to pass 12th from any recognized board with Science stream.
There are many universities that take admission on the basis of 12th marks,For instance,the University of Delhi,Mumbai University,St.Xaviers College,Kolkata,Xavier's College,Mumbai,University of Calcutta etcetera. You just need to meet the eligibility criteria of these colleges for taking admission in B Sc courses.
Hope this helps you.
Good luck.

Hii..

As you mentioned that you want to do science courses ...but you didn't mention the specific courses.. and also about your state or city where you want to get information so it is difficult to suggest you college with lesser fees kindly mention every detail so we can give you a proper answer.

All the best!!