Exam

It may help sometime. It depends on the efforts put by the student.

If you are qualified for JEE Mains then you will have to fill the online form of JEE advance. JEE advance has two papers. Question pattern for JEE advance vary every year. If you have crossed cut-off of JEE advance then you are eligible for admission in IITs but depend on your rank. If your score is

JEE exams are just tricky. Just clarify your concepts and then try. You will solve most of the previous year’s questions and in JEE advance you need to use many concepts in same questions.
To get a good NIT you must secure 170+ marks out of 360 and total marks vary in JEE advance but to acquire a se

Go through NCERT books and previous year’s questions. Then you will get idea about the questions asked in the exams. Actually, JEE Mains questions are not hard. They are just tricky. For JEE Advance you may go through books like HCV for physics and such type of books.

It may or may not be possible. If you are getting NIT on the basis of JEE Mains then go for it. If you want to drop then do it at your own risk. If you want to drop then go to Kota else you might get depressed.

No, there is no such requirement. You need not to appear for NEET to pursue BNYS. The NEET-UG examination is for pursuing MBBS and BDS courses only.

No, I have no college in my knowledge which enrolls students without any entrance exam. So, you will have to appear for an entrance exam to enroll in a B-school.

Complete your Masters first or look for an integrated program. Which subject is something you should know, if you don't know your research area then I am sorry that you are not fit for Ph.D. and no university will accept you.

Yes, there is some hope. Some of my friends are there with lots of backlog and year drops and they have GRE score nearing 300. It depends on your SOP, LOR and GRE marks.