It doesn't depends on how much time you are giving to one subject it's depends on how effectively you are studying for a subject.

Chemistry is the most scoring subject in JEE Main. It requires lot of practice. You can make your study plan. So, you can complete you syllabus on time and you get proper time for revision.

Give 4 hours to brush up your concepts of organic and inorganic for 3 hours and give 1 hour for physical.

Below are the some of the tips to clear chemistry-

• Conceptual clarity, application skills and awareness to the prescribed syllabus should be the main focus.
• Practice the most relevant numerical daily to develop speed. Pay special attention to the topics like Mole concept, Chemical Equilibrium and Electrochemistry.
• Adopt a careful and patient approach for Organic chemistry giving particular attention to the topics like Stereochemistry, GOC (General Organic Chemistry) and Functional Group Analysis.
• In Inorganic chemistry most of the questions which are asked are really conceptual, concerned with structures, processes and applications. Special attention is a must to the topics like Chemical Bonding and Coordination Chemistry.