Physics is one of main subject to go ahead careers of medical or engineering.

To get a hold on this subject, you will have to focus on few things:

• Get a sound environment with less/no distractions
• Arrange your study materials and stationery requirements before you start with the preparation.
• Plan your routine systematically and include short breaks in it.
• The breaks has to be no longer than 10 mins.
• Self motivation obviously is the key. So if you are not willing then no one can force you.
• You have to realize the importance of the subject, your boards or even in future and act accordingly.
• Priortize the main topics to cover first. 
• Do not only focus on easy ones and skip important ones.
• Give sectional/full tests to improve your preparations and analyse them.
• Refer to the standard material for preparations. Quality matters not quantity.

Good Luck.