Hello Venkataiah Maa,

If you get 56.7 marks in JEE mains exam under pwd candidate ,it is more than the cut-off marks and you have more changes of getting the seat in NITs college and also you are eligible to write the exam of JEE advanced  and the percentile and the list of colleges that you have chance of getting seat can be found by using the college predictor which is available in the below link.,

https://engineering.careers360.com/jee-main-college-predictor?ici=cp-listing_engineering&icn=JEE-Main-College-Predictor

Hope this helps you...