B.Tech

You may check the cut-off here in the below link.
https://www.shiksha.com/university/medi-caps-university-indore-49140/admission

I cannot say best but it's a good college. They will provide good facilities and campus too.

JNTU Kondagattu is not the best option but surely it is a good option. You can expect initial placement of Rs 20k per month. Infrastructure is very good and the campus is also good. Faculty is not good, so you have to be self-dependent on the studies.

Yes, GBU takes lateral entry in B.Tech in every stream. However, the candidate should fulfil the eligibility criteria which is 3 years Diploma course or B.Sc. Also, the candidate should have secured a minimum of 45% throughout.

You have to register on ukcounselling. Nic. In for Uttarakhand B.Tech counselling. Counseling for 2019-20 session will be started soon.

Admission to B.Tech in BIT Mesra is done on the basis of AIR in JEE Mains through CSAB (Central Seat Allocation Board) / JoSAA (Joint Seat Allocation Authority). Candidates must meet eligibility criteria and apply for the programme. For admission notifications on B.Tech please visithttps://bitmesra.ac.in/Show_Admission_Page?cid=1&deptid=11&pid=20

You can take any of these course as both courses are good. Select according to your choice whether you want to do M.Tech or not and also from the same college.

Except Jalpaiguri and Kalyani Government Engineering College, you can apply for any government college in WBJEE.

To register to any course, you will have to submit your original documents. I would request you to please inform your college about your discontinuing of course. Covering up all the formalities with college will help you get your original documents back.

Yes, as per JoSAA schedule, it is clearly mentioned that round-1 reporting dates are:
June 28th, 2019 to July 02nd, 2019 (5 days). So, these are (28,29,30,1,2) five days.
Best of luck.