I am left 42 days for jee advanced. I have prepared well in past 2 years. What should I do in these days left? I am very much confused. Please help

Nothing U have to do! Just revise all the formulaes and write them too for best learning.
Choose some chapters atleast 7 from each subject which u think are very important for Jee.
Eliminate yr. weaknesses and practice more.
After this U need to study those chapters those u know less!
And finally in the last week of jee advanced try to solve only n only Jee advanced sample papers which are easily available on internet.

This all i said
as i am also going to appear in advanced and going to do as it is i hve guided U.

Best of Luck!
dude!

and remeber i am yr. s . a competitor too!

do not panic,
and take tension,
just ty to solve as many sample papers and previous years quest. to know the types of sum that may come

just be calm and do the practice sets