SMEAT

In this rank, there is a very less chance to get this college. Please improve your scorecard.

It's hard to get SRM for CSE with a rank around 21k. Yes, but you can surely try for other branches like ECE, IT and Software.

According to your said rank and percentage in 12th, yes there is possible chance that you will get admission there , you should apply for counselling process
You can also use a link given below to get a prediction for you according to your rank:
https://www.shiksha.com/b-tech/resources/jee-main-rank-predictor

I suggest you to go with NITs if your rank is less than 800, or apply for JEE Advanced paper 2 and after results if you get the same percentile you can easily get admission in IITs for B.Arch!
If not you can go with top NITs for pursuing your B.Arch!

Yes, you can get a seat in SASTRA University but you can't get in branches like CSE. There are very few chances for you to get a seat in ECE.

Yes, you can get Muslim minority scholarship for M.Tech courses. But in that case, you will not get the national scholarship by the Government of India for M.Tech studies. You can get either one of these scholarships.
Best of luck.

You have very low chance of getting a seat in NIT Trichy but if the seats are available in the counselling then you may get low preference groups or try another NIT. You have a chance to get other NIT. All the best. Hope you may get good college.

Hi Purandhar, Yes, you can get admission in electronics and communication engineering with this score in JEE Mains. You should keep all the documents ready for verification. Your preference should be first CSE then ECE. Most probably you will get ECE in first round itself.
Best of luck.

Not every student gets a seat in JoSAA counselling. You will get a seat on merit basis only. Those who have scored good in the entrance, can expect a seat. But those who are having less rank go for private colleges and take admission.