Tell me about some colleges where i can get admission like st betes college in shimla  like more 

If you are asking for colleges in general, then almost of them require an aggregate of 50% in 12th standard.

Are you looking for colleges in a specific state or all over India?

Tell me about hp and chandigarh plzzzz 

Non medical B. SC  colleges in Himachal Pradesh are as follows :
Abhilashi University Akal College of Basic Sciences Arni University Baddi University of Emerging Sciences and Technology Eternal University Gautam Group  of Colleges Government College Government Degree CollegeIEC University Jawalaji Degree College Maharaja Agrasen University St. Bede's College.

Colleges in Chandigarh providing B. SC non medical are as follows-
DAV CollegeDev Samaj College for Women Goswami Ganesh Dutt Sanatan Dharam College Guru Gobind Singh College for WomenMCM-DAV College Shri Guru Gobind Singh College

 What about their cut off ...is their any cut offin these colleges or not ...

Yes,  they have cut offs. It varies year to year and is set by the college after the exam results are out.

So,can i get admission in these colleges or not..

Of course you can. You just have to appear for the exam and score the >=cut off set by the college to get admission into it.

Entrance exam ??? 

Yes, NEET. Most of the colleges grant admissions through the qualification of NEET. Some of them have their own college entrance tests too.