Thanjavur

No, the rank in NIRF is same for Sastra, Thanjavur and Kumkakonam.

Hello Deeksha, you have really good scores and hence there are high chances of getting CSE at SASTRA University. But it is difficult to predict the chances since the competition is too high. Hence, you can try your best in the counselling.
All the best!

Yes, you will definitely get admission in this college as you scored very good marks.

Yes, you can easily get admission in SASTRA college with this score and under this quota. But, you should try for the other good colleges of Delhi, Ghaziabad and other private colleges as your score is quite good.

SASTRA University is better than some NITs (some NITs does not include NIT Trichy). SASTRA University has better placements and salary packages as they have many tie ups with MNCs. They also offer Industrial exposure and Internships.
The infrastructure is also good at SASTRA University.
If you are aspiring to be a good engineer with a placement in top companies and also with a good salary then SASTRA University is a good choice.
Top 5 NITs are better than SASTRA. If you don't get a good course in those top 5 NITs then SASTRA University will be the better choice.

Hi buddy, I wouldn't say better. Infrastructure, technical support, facilities, extra curricular activities, all these aspects are similar. NITs are well established, funding support for research projects are better compared to SASTRA. I would rank them equal if not NITs bit comparatively better than SASTRA. As everyone says it's in your hands and your personal ability to make use of the best facilities and infrastructure available.
Hope this helps!

No, you cannot apply and if you have applied for B.Tech then it would not be beneficial for you.

Yes, you are eligible to apply for SRC, Kumbakonam.

SASTRA University is way better than Vel Tech. It's like comparing a mountain and a stone. SASTRA is better in all aspects starting from exposure, placements, cultural and academics. Visit the link and go the reviews tab for a better idea about the university: https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.shiksha.com/university/amp/shanmugha-arts-science-technology-and-research-academy-sastra-thanjavur-4075&ved=2ahUKEwi-mKb9vJzcAhUGQY8KHUS_CxMQFjAgegQIBBAB&usg=AOvVaw1_19cYL5V9nv0LWs6xc-5-&cf=1.

Hi Uday, It is advisable to choose the subject of your own choice. Both the subjects are equally good and have bright future. For college comparison you can follow the below link:
https://www.shiksha.com/resources/college-comparison.