Hello Aspirant.

As you've mentioned that you've got 86 percentile in your JEE Mains examination.

Now to find your general rank

Rank=(100-percentile)*8690.10

Now according to it, your general rank is around 1,21,650-1,21,800.

Now according to this, Your EWS rank is around 15,600-15,900.

Now according to this your chances of getting any NIT is quite difficult. Even if you achieve any NIT your chances of getting your preferred branch is difficult.

Best of luck !