Well,looking at u'r past records I assume that u r deppressed that u r not able to get gud ranks at school.Well,my advice is don't bother much abt getting ranks at school bcoz the portion for the school examinations r very theorotical.The point of u getting gud ranks in competitive exams shows that u r very objective type...right???My advice is on't be dippresed and try hard and have determination to secure a seat in IIT.Well,I presume that u may get a rank between 500-1500.