Hello

Your whole chemistry is divided into three parts physical chemistry ,organic chemistry and Inorganic Chemistry .

When it comes to solving numericals and MCQs in chemistry then you need to have clear understanding of the concepts and then you need to practice examples and then solve questions on your own

*For physical chemistry first of all go through the chapter then make a list of all the formulas and important concepts in the chapter then go through the solved numericals to understand how the concepts learnt are applied to solve them and then go for unsolved questions

*In inorganic chemistry, you basically have to  memorize things, show the best thing is read the chapter from NCERT and keep revising it at regular intervals , and practice lots of MCQs to increase your memory power after each chapter

*For organic chemistry ,  you don't need to directly mug up reaction , you meed to first understand them, what you need to do is first go through the reaction and then go through it mechanism as well which will help you to understand how the reaction proceeds and then write two- three times the reaction and its mechanism on your own and then practice some questions on the same reaction and you need to follow this process for every reaction in organic and soon you will be good at solving questions in organic.

Thankyou