Dear applicant the first set of suggestion would be not to panick, it's your time and you will prove yourself, have faith and keep on working hard. I know it's very difficult to balance both HSC and NEET but you can focus on few important portions of Physics like Electricity, Magnetism, capacitors and vectors. Solve sums specially from previous years papers, when it comes to Chemistry give priority to organic chemistry and s,p,d,f block elements. Solve as many MCQs as you can and simultaneously read the portions for boards.

Hope it helps!!

Good luck!!