Hi aspirant,

You got 100 in nata exam & 63.8% in your board exam.

Now, see, for general catagory,

With >155 marks, you can get a descent govt college.

With 130 to 155, you can get a good private college.

With 100 to 130, you can get a medium good private college.

It can be varied slightly.

Now, as you are in OBC catagory, you have a good chance to get a good private college.

All the best  !!

:)