My Dear friend,

the easiest way to do so would be to use the rank predictors of coaching institutes. However, I would recommend that you focus on upcoming exams and try your best. This quest to know your rank before the actual list comes out would only cause you mental pressure.

So this marks arent enough for you to get some branch in some good NIT and so u should focvus on the other exams and study hard to get a good engineering college. 

Best of luck!