Hello.

You did nothing wrong because a failure earns more knowledge than a successful person.

However now you have another chance why won't you make use of it. Think big like , how my life is going to be if get in IIT or NIT else you will be studying in boring local colleges where you will never find knowledge and freedom.

A good strategy always considers all angles of the problem to know them well before solving it . Similarly, any aspirant must check the IIT JEE Syllabus, exam pattern to know what he/she is up against and then aim to crack it . Check the 16 steps to crack IIT-JEE, follow them to get a foot into the IITs .

https://www.google.com/amp/s/engineering.careers360.com/articles/16-steps-crack-iit-jee/amp.

So keep motivating your self and go with the flow.

Hope this is helpful.

Good luck.