Even If you pass jee mains with good rank, you need 60% and above in boards to get admission in any college. If you haven't got 60% there is no point of passing jee. If you have got 60% and also passed jee, then you'll get into a college, and how can you give boards when you are in college. So either way, no, you can't repeat boards even if you pass jee mains until and unless you got less than 60% in boards or didn't get into a college.

Thank you.