Computer Science and Engineering

B.Tech in computer science and IT are somewhat the same courses. If you are approaching engineering in either of these then make sure you have a good grip over your coding. On the contrast, ECE doesn’t require much coding.

You can apply on after the declaration of supplementary exam's result.

Hello Preetham,
There are many good engineering colleges in Chennai with good rankings. As you have scored 95% in CBSE boards you can opt for SSN College of Engineering, Kalavakkam. It is a reputed college which offers better education and placements.
You try to get the top colleges in Chennai like An

Hello,
CSE is the most demanding branch nowadays and it has more scope and job opportunities in future.
Mechanical engineering is also evergreen branch but it has fewer placements than CSE.

Dear
You would prefer JP Noida because SRM Ghaziabad is not an established campus and having average placement and opportunities.
You can check the record of JP from their website for further information.
All the best

Hello Shubham
Yes you can get good colleges such as NITs as your rank is good:
http://josaa.nic.in/Result2016/result/OpeningClosingRank.aspx

Hello Saurabh,
In this college, admissions are normally based on MHTCET. However, some seats against All India Quota are filled by JEE Mains ranking. But your ranking is really low and I fear you have only a slim chance.