I am wondering if I should prepare for AIEEE or IIT-JEE?

If a student is reasonably good, he/she should prepare for JEE as this by and large takes care of preparation of AIEEE and other exams. Statistics shows that some differences in the syllabi have marginal effect as far as the end result is concerned in these type of exams in which cut-offs go too low due to the difficulty level. Also, AIEEE 2008 has changed pattern and is more like IIT-JEE.