Hello,

You have to solve 150 questions in 180 minutes or 3 hours in the HPCET 2019 examination. So, the questions will easy but conceptual and typical.

Your basics in Physics, Chemistry & Mathematics should be very clear upto 12th std. You should read the NCERT books for basics. Then HC Verma for Physics, RD Sharma for Mathematics, OP Tendon for Physical & Inorganic Chemistry, and Organic Chemistry of "Arihant Publication" for detail or extra knowledge. 
You should also try to solve the previous years question papers, this helps too much and you should also give the mock test to rectify yourself and build your confidence level.

For preparation of exam, the most important thing is your confidence after that you should know the whole syllabus and make your plan properly for learning new chapters, solving the numericals and revision. All three things should be the part of your preparation strategy in daily routine.

In order to know the syllabus and other things about the HPCET 2019, please go through the link given below

https://engineering.careers360.com/articles/hpcet

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All the best.