Hello,
You have to score 90% of total marks in jee advance. To appear jee advance you have to clear JEE mains with good marks. Over 2 lakhs candidates are selected for jee advance. And mostly over 6 lakhs candidates appear jee main. It like 1/3 part appear in jee advance which shows the competition is really high. So prepare accordingly and solve as many questions possible. The more you practice the more you will improve your performance. Don't try any new concept now. Just practice those chapters in which you are confident and you won't get confused.
Hope it helps!

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