Hello,

To get 50+ marks in chemistry in JEE Mains in 7 days you should go for a thorough revision of NCERT.

Divide your whole syllabus as organic, inorganic, stoichiometric, physical chemistry. And read each part daily or one part for day according to your grip on that particular part.

At the last day revise all the formulae and chemical reactions that you have read from NCERT textbooks for these 3 days.

Be calm and cool, avoid silly mistakes and I am sure you can cross 50 marks in JEE chemistry part.

Hope this helps,

All the best !