how to revise chemistry in last time ??????

You can go through below tips -

Chemistry: Chemistry is often regarded as the toughest subject by students. On the contrary, it is one of the easiest if you can develop an understanding at the basic level. This can be done by strengthening your concepts through elaborate revision of chapters and individual topics. Begin your preparation with Physical Chemistry and treat each and every topic as a chapter in itself. Later, apply your concepts on MCQs and question banks. In Inorganic Chemistry, before starting a topic, look up to previous years question papers to understand which are the topics from which the maximum questions are asked. Repeat the formula chart activity (include formulae of important chemicals and minerals) as done in physics and memorise them daily. Frequently revise topics such as coordination chemistry and p-block chemistry to ensure maximum retention. Keep on trusting NCERT as far as Inorganic Chemistry is concerned. Other topics demand a clarity of concepts. Here, you can take assistance from study materials for additional references. It might take extra effort but you must maintain your confidence and consolidate your concepts. Approach easier sections first and then move on to difficult portions.

Hope this helps!!!