Dear Ameya,
To get a good rank in your AITS you need to practice a lot.
First, try to clear your concepts build your fundamentals strong.
Make sure you always analyse your test. Try to understand your weakness and try to overcome it.
Always try to learn from your mistakes and don't repeat them.
work on your time management as it is very important for any competitive level exam.
Focus on the chapters which carries more weightage in the exam it will help you to improve your score.
All the best!!
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