Charan, for being eligible for securing a seat in any Engineering College through EAMCET, you should have completed your 12th in Physics, Chemistry and Mathematics and secure the minimum required aggregate against your Category.You should have completed your 12th atleast by the time of counselling. It doesn't matter whether you have passed your 12th through the regular exams or supplementary exams. Do not let these things bother you. You should focus on your EAMCET preparation.