There are not many specific books and references for studying maths for JEE Advanced

The important thing which I personally felt was that I gave much time to the topics I was weak in but those did not give me the expected return on the day of the exam. My circumstances were different as I had little less than 2 months for specific preparation for advanced (2022), and the math section was especially hard, needing a lot of practice and the IQ to understand the trick behind the questions.

My recommendation for these reasons is to raise your level in topics that are your stronghold. You can definitely consult others and make the decision that ‘you’ like and won’t regret later.

Maths can be built strong only through practice ‘once’ you grasp the theory. Solving Advanced-level questions is only possible when you can connect the logic and process of approaching a problem. Thus, it is very important to understand and learn to implement an approach when you see the question. Your mind should be clear after reading a question on how to start it and how it will end.

You should focus LESS on solving complex problems and instead get a good hold of the approaches to solving the basic questions. basically, repractice questions you couldn’t solve earlier, mistakes in tests. Once the ‘fundamentals’ are strong, you will automatically be able to see how to approach a certain problem.

You probably have been doing the practice since 2 years. You can add ‘the black book’ to the practice if you want. Other than that, there isn’t much guidance to be given for the maths section.

You don’t have to follow me, but my mindset before JEE advanced was not to get full marks. no one even gets full marks, so just focus on your strong parts and give the best in those.

From a university perspective, calculus, linear algebra, and probability are the most used and most important parts of any engineering program. Get a good grasp on those.