My friend got 398 marks out of 800 and his rank was a little over 4000. So 399 out of 800 would be a pretty good score. SO going by the past trends you may get the same rank around 4000. Last year cutoff for Electronics and Communication (EC) was 6483. Going by that, you have a pretty decent chance to get an admit in that. But these year the trends may deceive you a little bit due to all this chaos and pandemic. Yet it will give you a rough idea.

Good luck!