what should we be doing 10 days before jee advanced?

Once my teacher said that …. Imagine there is one PC which is being used from 3 days continuously and on next day you wants its best performance . It will not give . 
This is Epic thruth JEE Advance is not such exam which can be cracked in few weeks . Just be confident , Just believe in yourself that you have enough Knowledge . 
Confidence matters alot . 
My Personal advice just before exam do lots of fun , Eat your favorite food . Be relaxed . Take a proper sleep (atleast 7-8 hours) .You can read in these 8 days what you love . 
For Eg. I love Organic Chemistry and Mechanics .

Best Of luck . Do your best . Don’t Panic . :)
 

Just re-visit your notes, go through the tricks and tactics that you have learnt so far and being fully prepared attempt the test, wait for result and conduct a kind of survey of certain renowned colleges/universities and IITs to get a breakthrough entry...I can suggest

Birla Institute of Technology and Science, Pilani

Recheck your notes of entrance exams, raise your horizon of tests, keep searching about the protocols of IIt and try to give many mock tests and interviews, get an idea for breakthrough in IIT. Do not be give up with only JEE exams, try to search on engineering and technology. I suggest you some universities such as SRM university Chennai, Karunya university Coimbatore, Lovely Professional University, Phagwara.