JEE Advanced

You need to get 90% in general category.

No, you cannot as you have already consumed your 2 chances of appearing in JEE Mains.

You need to be confident and revise formulas. Do not try to learn new concepts and take a complete sleep.

In my opinion, HC Verma is a sufficient tool for JEE mains and advanced. If you have a strong foundation, then solve problems from it. This will strengthen your concepts. However, if you want to make your fundamental clear, I would suggest you to refer some other good books like Pradeep or ABC.
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The number of hours actually don't matter for studying. It depends on how the concepts and topics are getting clear to you. Whatever you read, do it efficiently at a time. It is better to plan your studies.

Hi,
From this year, there will be no contribution of 12th marks to get admission in NIT. But, you should satisfy these 2 criteria to get admission in IIT.

obviously it is compulsory because only 7 iit conduct jee advanced if you are going for iit Bombay then you should get a good rank in jee advanced that is under 500 to 1000 for any doubt or preparation r

An expert panel "Committee of Eminent Persons", constituted by the IIT council and headed by Ashok Mishra, the committee has suggested that JEE Mains and JEE Advanced be combined into a single engineering entrance exam. But there is no final decision announced on this subject by MHRD yet.

Old NITs are the best. Some of the top level NITs are MNIT, Allahabad & NIT, Warangal. IISC, Bangalore is also famous as it has good placement. IIT Roorkee is famous for its civil branch. IIT Kanpur and Bombay are at the top level. New IITs are not good in terms of placements and facilities.