Yes you can appear for IIT JEE next year ..
The criteria for IIT :
The candidate who have passed 12th or equivalent with aggregate 60% marks, eligibile for IIT JEE 2010.
5% relaxation for SC/ST candidates in aggregate in 12th or equivalent exam.
The students who are appearing for 12th board exam can appear in IIT JEE 2010.
Age Limit: For General category the candidates should not be more than 25 years as on 1st october 2009, For SC/ST candidates the age limit is 30 years.
Please feel free to post as many doubts on our disucssion forum as you can. If you find any question difficult to understand - post it here and we will get you the answer and detailed solution very quickly. We are all IITians and here to help you in your IIT JEE preparation.
All the best.