How Can I solve JEE Main and JEE Advance maths hard level problem in 1 min

Hello,
For this,you need to have all your basic concepts clear and you have to first solve whole ncert book to enhance your problem solving skills...After that refer to other books like RD Sharma,Arihant mathematics,S.L Loney and try to practice most of the problems and analyse the formulas which are to be implemented in the questions.
You need to practice a lot to solve questions in less than 1 minute....You should give mock tests for jee mains and advanced to increase your speed and join some coaching institute for online test series program.
Good luck.

• your fundamentals are very clear
• Start your IIT JEE preparation with Class XII textbooks that you have. You can also refer to NCERT books that are prepared by many subject experts and are quite economical too. IIT preparation is a devotion that needs to start early.
• Time management
• IIT JEE paper of last three years.