Below are the startegies which you can follow-

 

Physics

• Note down the formulae and results, it will help during revision.
• Practice as many questions as you can, keeping in mind the availability of time.
• Avoid lengthy and complicated problems at the last minute, if time is limited.
• Focus on your strong areas.
• Suggested Reference Books: H.C. Verma & Resnick Halliday
  Chemistry

• Chemistry is amongst the tough subjects as it involves cramming of formulae and reactions.
• Understand the conceptual base of the topics.
• Periodic table is the most scoring part.
• Suggested Reference Books:  Morrison & Boyd and O.P. Tandon
  Mathematics

• Conceptual understanding should be preferred.
• Practice a lot
• Suggested Reference Books:  R.D. Sharma, Arihant, Hall Knight & S. L. Looney

You can go through the below tips -
Physics -
Learn Formulas Thoroughly
Learn Derivation Of The Formulas
Concentrate on Scoring Topics
Diligent Practice is a must.

Chemistry -
Improve Your Concentration And Application Skills
Study With Patience And Attention
Practice Reactions
Regular Revision should be there.

Mathematics -
Conceptual Clarity as clear your basics properly.
Take Mock Tests on regular basis.
Solve Practice Questions.
Solve Previous Years Question Papers.

To get detailed preparation tips, you can go through the below article -

How to Prepare for JEE Main 2018?

Hope this helps!!!

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