JEE

Your expected JEE Main AIR is about 137905. The last year JEE Main closing percentile in TIET for Punjab general category for few engineering branches are given below for an idea.
1. CSE : 96
2. Electrical : 73.65
3. ECE : 70.68
4. Mech : 76.41
5. Mech(Prod) : 70.61
6. CSE Derabassi campus : 85.72
7. Civil : 69.54
So keeping the previous year of trends in consideration, you can get Electrical, Mech, Mech(P), ECE, Civil and CSE (Derabassi campus).
Good luck

Sastra CSE branch will have more competition. Maybe you won't get CSE seat. If you are more college preferable and in 1at year all people will read the same. So if you are confident that you will get 9 GPA then you can get your CSE branch then. If upto now your are adjustable with any branch you can apply.

There will be a very less chance to get ECE seat in sastra Thanjavur. We have kumbakonam branch of sastra there you can get your ECE seat. Apply first and then they will give ranking based on that they will give instructions.

Sastra won't considers any EWS type. They will consider AIR ranks only. Maybe it's difficult to get a CSE seat with your score. If you are more preferable to college and don't consider any branch in first year. If you avail 9 GPA in 1at year. You can change your branch from anything to CSE.

Yes, you can get your seat in aerospace if you apply in stream1. If you don't get in 1st counseling don't be panic maybe you can get in last counseling. Try up to last.

I think it won't be sufficient to get a CSE seat in SASTRA. If your JEE AIR rank is below 30,000 you can get a CSE seat.

If you are ready to take any branch seat maybe you can get something in 3rd counselling . But you are expecting ECE seat which is not even possible . If you want to apply in stream it requires 970-985 marks in IPE and the Jee AIR rank has to be in below 40,000