There is a necessicity for some preparation and also practice. This is because AIEEE is more of objective type which tests our speed. So, you would require some practice. The syllabus for IIT-JEE and AIEEE are not the same. There are some portions included in physics and chemistry other than the Portion for JEE. So, u need to cover that syllabus and improve the speed.
Please feel free to post as many doubts on our discussion 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 !!!