Dear aspirant,

If you are facing struggles with any of your main subjects then the first thing you should do is buy a good book of that subject. the type of questions that has been asked in competitive exams and your boards are quite different and required a different methodology to study them. The questions in your board examinations are more concentrated on direct application of the concept on the definition of the concept itself however the questions in competitive examinations are more of application of that concept. if you are in 11th class then you have a plenty of time to first get your basics clear and then I want to prepare for competitive exams in your next year.

Coaching is always a good idea if you are facing a lot of trouble in understanding the concepts you can always join a coaching.

Some of the good institutions for preparation are

RESONANCE, Aakash institute, etc.

Hope this helps. thank you.