Study for only 25-30min do not go for longer time because scientist says that after 25-30 min studying your brain decrease the power of concentration.
Read from different sources. Read the same things but from different sources it will help you to know better.
Do not remember it if you didn't understand.
What you learnt today if you have the capability to teach that others than you really understood that.
What you are reading feel it practically by this you will be able to learn it properly
Do not go for longer plan , go for short plan.
Overall enjoy your study and have fun with it.

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7 tips that will help you to study properly