Based on last year closing rank data, with your rank you are eligible for most branches at Sikkim Manipal University. You can also get in some branches of Manipal University Jaipur. You should opt for Jaipur Campus as it is far better than SMU.

Please have a look at the closing ranks of Manipal Main capus, Manipal university Jaipur and SMU from the link

https://engineering.careers360.com/articles/mu-oet-cutoff

Yes you have start attending counseling session of the manual university as early as possible.

Little patience is require to get  admission.Start taking part in counseling session as early aspossible

All The Best