i prticipate in 12 class exam in session 2012-2013 & got 77.8% i want to take part in cbse improvement exam in 2 subject physics & maths when will they held ? will the marks i get in improvement exam considered in jee mains & advanced ? if i got less marks in improvement exam than previous score then which out of these score is concidered in marksheet or best of 2 marks in each subject concidered.