Dear Student,

50 percentile is not a big deal to score in jee main, anyone who tick just random answers can achieve the percentile of 60, according to your previous one you have improved but this score is also not enough to take admission in any of the college, better you try one more attempt of August one and try to score more than 90 percentile so you may get some option to take admission in some private colleges with some fee concession.

You can also take direct admission in any institute of your region if you don't want to give the another attempt, you can give the exam of scholarship for that particular college (only few are available) to get some concession in fee amount.

Best of Luck!!!