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All the 3 subjects I.e. Physics, Chemistry, and Mathematics are equally important and you have to work sufficiently on each of them. If you are competent enough to solve the questions from all the three subjects, try to gain expertise on your the strongest part/ favorite area.
Instead of learning new topics, try to revise already completed syllabus.
Prepare a proper study place and stick to it. Don't study in a haphazard manner.
You can plan in one of the following manners
You can study the 3 subjects daily by dividing the total study time.
You can study a particular subject for 1 or 2 days and change the subject after that.
You can even plan to study 3 subjects in a week and revise on the 7th day. Quick revision is possible if you form a habit of noting main points on a separate sheet while studying.

Better to go for MBA-HR, as it is in line with your work experience. HRM is a comprehensive approach which guides one to strategically manage the people and enrich the working environment of the organisation. The effectiveness of Human Resource policies is a guiding factor in employee performance and productivity. HRM has shifted its role from mere personnel management to largely strategizing policies which will help to add value to the organisation and thus impact the performance of the organisation substantially. HRM is that function of management which will possibly never lose its sheen. This department is in a way the lifeblood of any organizational set-up because right from recruiting the employees, this department is responsible for designing policies, redressing the disputes and not only enhancing but also enriching the job performance.