Harry in your query mentioned all about your current academic records and what is your ambition to do after taking a drop but you haven't asked any question. Your query is incomplete, please comment below to ask what you actually want to know?

With your statement whatever I have understood that you have got a fantastic score in 12th board and you are a very smart student and because of not a good preparation you were not able to perform in both JEE Mains and JEE Advanced exam according to your calibre. So, you have taken a very good decision to drop for a one more year, now you don't have any burden for your school studies so you can definitely concentrate only on JEE preparations and get a very good score.

Feel free to ask if you have any more queries. All the best!!