hi,

see physics and chemistry is two important subjects for any competitive exams point of view, let it be jee main or neet or icar or any other state entrance exam, if your base of 11th an 12th is not good, you can not recover it in just one year, so your conception should be very clear and you must have notes for 12th exam ready to revise. you need to think that are you getting real interest for the science subjects, if you have confidence enough that you can surely get over it then you may try for neet next time, but kindly also attempt this year exams to gain experience, since lockdown of covid 19 , exams get delayed, you can utilize this time to betterment of your studies.

you may use careers360 neet knockout program to boost up your performance,

https://learn.careers360.com/knockout-neet-may/