B.Tech

I think Amity is a great choice but costly too .on the other hand indraprastha is also a nice choice but worst think about it is it's infrastructure.think thoroughly .think about your future

B.Sc in IT or BCA

Depends on your inclination.If biology has been one of your favourite subject and you want to do research and innovation,you can go for biotech or if you have fascination for computer programming than BCA

you can but you have to buy some more for gaining knowledge

There aren't much difference in these courses but Now days Many MNC are preferring B.Tech in CS more in comparison of B.Tech IT.
Also there is another factor which will help you to choose one of them is that in which institute or college you will study these courses. It's better to choose that colleg

Which university is your college affiliated to?
To score well you need to study very well and thoroughly. Books provided by college are usually enough if you are pursuing engineering from an autonomous college. However if your college is not autonomous, then you must solve previous year's papers and

Amit, please check the link below to know the tentative colleges that you can get with this rank
https://www.shiksha.com/jee-mains-college-predictor
Other than this you can try for admission in private universities. These days we have so many good private universities that are imparting quality educat

India has very good engineering colleges fir B.Tech in Civil Engineering. IIT Roorkee is one of the world best institute for civil engineering. You are advised to study civil engineering in India. You may opt for PG abroad for specilaisation.