If you are preparing for AIEEE, then you must understand that the level of difficulty in these papers is much less as compared to that in IITJEE. The first thing one must do is attempt/try solving as many previous year papers as you can get a hold of. QUESTIONS IN THESE PAPERS ARE OFTEN REPEATED (if not the exact same question, then similar questions can definitely come). Why loose marks in questions which have already appeared in earlier tests?
Lots of questions in these papers are formula based (unlike IITJEE). So make sure you remember all PCM formulae and have thorough knowledge of how and when to apply which.
These tests are primarily speed tests. The hardly test your mental ability or conceptual understanding. They test how quickly you can answer simple, straight forward questions. So if you are naturally slow in solving problems, you are in for trouble. Remember that people, who top these tests, finish the entire test. People who are just able to make it, attempt at least 80% of the test. But knowing this, if you now try to hurry up and try to attempt all questions (without making sure if the choice you entered was correct or not), then you might loose marks in negative marking. So try to be fast; give lots of model tests at home; see your score for yourself at the end of the test; observe your improvement.