IIT and NIT eligibility criteria for PWD category candidates is 65% in your class 12 boards.

Mht CET colleges eligibility criteria is you need to get 50% marks .

For IISER you need to individually pass in all the subjects.

As you have got 334 marks out of 500 you have secured 66.8 % in your class 12 board which makes you eligible to appear for all the exams.