I am in 12th right now and I am preparing for COMEDK 2021. I know the concepts and formulas but I am unable to solve complex questions from my guide and previous year papers. But then when I look at the solution in the answer key I understand. What should I do? I am using dinesh kcet guide and ncert

Dear aspirant,
COMEDK, firstly it is not an easy task to do. It is a very tough exam but as you know there is not any exam which is impossible to clear.
My first suggestion to you is that go through your 12th board and then when it comes to your COMED exams. Firstly, practice and practice! Practice is the most important part of learning and to clear any exam you need to practice a lot. First try those examples that are easy and then slowly move to the tough questions and then complex questions.
Take any guide of yours, firstly check the examples and then close the book and try it on your own. And then slowly come to complex questions and try the same scheme for those questions as well.
Have a fresh mind and focus on the examples and questions, how those have been solved? Which formulae have been used? It doesn't matter if you know all the formulae, go through them again again and if you find any question difficult to solve, see the solution on the guide and try to solve that question again and again. Go for mock tests and also try to solve more previous year papers. You will definitely crack it.

Best of luck for your exams.
Hope this helps,
Thank you.