Engineering Entrance Exam

Basically, it is Rs. 40,000. You can negotiate with the coaching administration.

Prepare a time table first and then decide which subject to study first. After sometime, take some 5 to 10 minutes rest then start studying the other subject. Keep doing this everyday.

Hello Jaya,
Your chances of getting NIT is very low. Your category rank should be below 4000 to get NIT.
However, you can get a seat if there are any NITs in your state (home state) based on home state ranks.
You may refer below for the official opening and closing ranks for each NIT in the 7th round of counselling:
http://josaa.nic.in/Result/result/OpeningClosingRank.aspx

You can get admission in NITs, IIITs and GFTIs through JEE Mains.

Sorry to say, but your chances are very slim.
All the best.
Try your luck in spot round.
Hope this helps.

For physics, reference books are: Dinesh+ Concept of physics (Part 1 and 2).
For chemistry, reference books are: O. P. Tandon+NCERT
For maths, reference books are: Dinesh+NCERT
Moreover, go through the last 25 years JEE Advanced question papers.

You are advised to wait for one year and prepare well further.

If you have not done good this year but you think that you perform better and if this is your confidence level then yes, you can drop a year to prepare for JEE Mains. But also remember if you are dropping a year then you have to study really very hard so that you can get a seat in IITs/NITs. This should be your aim.

JEE Mains is held all over India. It is a joint entrance exam which is conducted all over India by CBSE.
Through this exam, you can take admission in the good engineering colleges like NITs/IIITs/GFTIs.