For Bsc In ahmedabad you need to score more than 50% marks in GSEB board exams..Then you get any of the Bsc colleges because Dthere are more number of seats in BSC then number of applicants...

So you just need to Make your Merit.of 3 subjects more than 50%..then you will get in to Bsc..For Good college you need to score more than 70-75%..