There are various compiled lectures available on Youtube although you can check below link for reference.
http://www.kaysonseducation.co.in/iitjee-math-video-lectures

To improve your maths go through NCERT books for your preparation. The NCERT books contain all the relevant matter along with basic, mediocre and easy questions. They help in laying a firm conceptual groundwork and in boosting your confidence with speed. Once you grasp all the concepts you can move over to the advanced level problems to get max exposure. You can solve previous year questions papers to understand the level of questions and difficulty and solve as many as mcqs for your practice.

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