HI VIKRAM

yess surely go for it

any student can reappear for jee main's exam consecutively for 3 years straight that is total of 6 exams for the individual as their are 2 exams held every year on mains as long he is passed his main 12th board exams for a minimum of 50% marks in PCM

if he/she fails in one year of board exams and is going to attempt in next board exam if he/she passes in that exam he/she is eligible for the respective jee exam in that year.

for any more doubts you are fee to ask more questions and also if you want to research yourself go on to jee main's main site and go through their list of rules.

BEST OF LUCK!!!!