JEE Advanced

Try to work on basic concepts, for that IRS good to refer NCERT. Try more application based problems from reference books, it would be a good option to join a good coaching institute as they have a planned schedule and regular tests will help you to get a good know-how of your preparation.

It depends on your grasping skills. You can prepare using YouTube videos but do take regular tests to evaluate your preparation. I would suggest coaching is better option as they follow a proper schedule and coaching environment encourages individual to take studies seriously.

If you are a general category student then you need to score around 170 -180 in JEE advance to get any good branch in IIT BHU.

No, if you don't qualify JEE Mains you will not make it your way up to JEE Adavanced.

You can appear for JEE advance for only 2 times.

It will be between 500 and 1000, depending on the caste.

Both exams are good and the preferred book is NCERT.

Hello Shubham,
Yes, if you have out in efforts after your last failure, there is no reason as to why you can't clear JEE Mains in 2018. But have a look at eligibility from date of birth or passing if 12th perspective.
Best wishes

Hello Anuvab,
There are plenty of students who crack this exam without any coaching and there are thousands who do not clear in spite of coaching. It all depends on your aptitude and determination. Every thing is possible.
Best wishes

It depends on this year's cut-off.
If your marks are more than the cut-off marks, you will definitely able to appear for JEE Advanced.