Hello,

The usual eligibility criteria for BSc is passed 10+2 with science stream from a recognized board with 50% or above aggregate depending on the norms of the university, the cut-off varies among colleges, for instance in case of north campus of Delhi University the cut-off goes pretty high, for General Candidates it goes above 95%, so it's not the same for every college but for a decent college getting 85-90% may help, if your query is for any specific college, do mention in the comment box below so that we can help you with more detailed information regarding this.