Computer Science in India

Computer Science is 3 years of Graduation course while B.Tech is 4 years of Graduation course after which you will get an Engineer's Degree. Benefits of a B.Sc Computer Science. Moreover, after completion of B.Sc CS, you are eligible for applying in MCA.

The following colleges can meet your requirements:
1. The Oxford College of Science
2. Loyola College, Chennai
3. Women's Christian College, [WCC] Chennai
4. St Xaviers College, Mumbai
5. Hans Raj College New Delhi
6. Fergusson College (Autonomous), Pune
7. Jai Hind College, Mumbai

Hello Sir,
Here are few engineering colleges:-
NRI Institute of Technology, Hyderabad
NRI Institute of Technology, Agiripalli
NRI Institute of Technology, Guntur
NRI Group of Institutions, Bhopal

Hi,
It will be a wrong statement if I say no. Many companies still trust to someone who has a Graduate Degree from a renowned institute/colleges, however to make your profile strong I would advise to pursue IT Professional certification course (s) in parallel.

Hello Tanmay, Your ranks are used for admission and there is no particular scores which are fixed for admission into the colleges. The ranks vary every year and so it is difficult to predict the colleges that you can get. So, after seeing your ranks, we can conclude your admission chances. And, why do you aim for just 100-129? Try to score around 200-250 so that you might not doubt your chances.

Overall course is same but there are much more placements in CSE.

For B.Sc in computer Science, the cut off was 71.39%.

All depends on your effort if you study well it won't be hard for you. As you said that you had CS in class 12th, that will come handy as you will be a level ahead of most in computers.
All the best and choose wisely.