Engineering Entrance Exam

From the analysis of previous counselling process, if you wait till the 3rd round, you might get civil in Heritage with this rank.
You will get Applied Electronics in Heritage College with this rank.
In IEM, there is no scope for any branches.

In Heritage, you will not get any branches with this rank.

No, you will not get mechanical. I think you will not get any branches in Heritage with this rank.

You cannot get admission in Heritage, IEM,Haldia but in BC Roy chances are very low for computer science. You have to wait till 3rd round.

With JEE, it's really hard for you to get any college unless you're from some category. With your other rank you may get some decent state government college for that please check Shiksha college predictor for exact predictions.
All the best.

If you are able to pay the fee required then you may get admission in Amity easily. You may need recommendation to get admission.

Chances are slim, though you have chance to get some decent government college through JEE itself try to get in those.
All the best.

It will be difficult to get top IITs/NITs/IIITs at this rank. Other colleges you may expect like Tezpur University, Sant Londowal Institute of Engineering and Technology, Institute of Technology Guru Ghasidas University, HNB University. Check the below link for courses you may expect in these instit

Without doing registration, you cannot get admission in any reputed college.
But still, there are some colleges which take direct admission.

All books are sufficient for the student who wants to study and no book is sufficient for those who don't have interest in studies.
So if you can understand the language of the books easily, you can opt for them. But if you aren't able to understand, then go for Arihant Publications or Pradeep Public