stream related to Physics and maths after 12th without entrance
hi,
you may go for bsc in physics/ bsc in mathematics/ bsc in electronics science after completing your 12th course from pure science stream, see many of the colleges under calcutta university, delhi university takes admission based on 12th score. however for tier 1 colleges like banaras hindu university, IISER you need to appear in entrance test.
hope it would help.