Exam

To get admission in Jaipuria, Noida, the cut-off in MAT is around 500.

IIM-Ranchi is one of the best management institutes of the country. It will be most beneficial to do a post graduate course on Management from there, if your interest lies in that domain.

Here's the link for Official NEET syllabus:
Hope this helps.
https://cbseneet.nic.in/cbseneet/ShowPdf.aspx?ID=98FBC42FAEDC02492397CB5962EA3A3FFC0A9243&Type=50C9E8D5FC98727B4BBC93CF5D64A68DB647F04F&ved=2ahUKEwjVg7Gi88bdAhWQfysKHe5nBwAQFjARegQICRAB&usg=AOvVaw3gTCQFLmyVqvKkPqNWXKMB

Absolutely yes. For admission into MBBS and BDS courses in India you have to appear the common entrance examination called NEET. There's no other gateway.

All good colleges abroad require IELTS or TOEFL score to test your English skills. If a college is allowing admission without it then I am not sure if it is a good college and you should take admission in.

The important topics to be covered are:
1. Sketching.
2. Basic Maths and Aptitude ( refer R.S.Aggarwal for previous year question).
3. Logical reasoning
4. Isometric view.

Yes, of course you can get it. You just need to be good in the interview.
All the best for your bright future.

Yes you can, although preferably take a transparent ruler, there are no restrictions as such on carrying a ruler or an eraser.

No, there is no problem in doing 10th as a private candidate. You can do without worries. Best wishes to you.