I got 63 marks in JEE main to which college I will get admission

Sorry to say but you didn't scored enough to get admission in NITs or any other government college as to get one you need to score a rank below 50k and these marks will give you a rank around 1lakh . Though you may get any private college but you might not be able to get the core branches . So I would suggest you to rather prepare for any other engineering entrance exam or to look for any good private college and side by side you can attend the jee main counselling and try your luck.
Good Luck

It depends on your cut-off rank in jee main examination. According to your cut off rank  u will get admissions in the reputed colleges.You can get admissions in good  private colleges. But try your best to get admissions in good college . All the best for your Future.