Hello Aspirant.

There are several colleges in Kolkata that provide the course of BSc honours in many streams. Some of them are.

1. St. Xavier's College

2. Jadavpur University

3. Maulana Azad college

4. Presidency University

5. Bethune College

There are several other colleges where you can take admission and every college would have their norms related to percentage as you're a dropper candidate.

Best of luck