You can rank calculate yor rank using yank formula for jee mains is is (100 - your total score) X 869010 /100 (tel:869010100) .100 - your total percentile score is the percentage  of people ahead of you. 869010 (tel:869010) are the number of candidates appeared for Jan exam.If the number of candidates for April exam increased to 1200000 (tel:1200000) then your final rank shall be (100 - your total score) X 1200000/100 (tel:1200000100)
So your approximate general rank will be 67782it will be difficult to predict pwd rank .you can refer the link below to know in which college you can get admission .