Hello Jyotsna,

The main thing is that you have to build your concentration level, then only you can stay focused on your goal. I would like to say that please limit the study time between 10 to 12 hours and please increase your concentration and speed of reading, understanding and solving the problems then you will not face any kind of difficulty.
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.
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. 

In this way, you can prepare well for the MHT CET 2019 examination.
Thanks for query on this platform, you may visit again
All the best for your examination.

Hey Jyotsna Jabshetti,

Yes there are reference books for MHCET, you can go through them which is given below,

MHT-CET Guide Physics
2.LSOFT MHT CET 2018  PCM Postal Test series. Includes 84 Question Papers with detail Solution & 84 Practice OMR Sheets as per Examination Standard, with Computerized checking & Reporting facility
3.MHT-CET Guide Chemistry
4.Complete Reference Manual MHT-CET 2017 Mathematics: 25/8/2015
5.MHT-CET PCM Online Tests Series 2018
6.Marvel Chemistry for MHT-CET
7.Uttam MHT-CET Physics
8.Engineering CUT-OFF 2016-2017 with MHT-CET, JEE & Merit Numbers for 2017-18 Admissions.
9.Uttam MHT-CET Mathematics
10.Marvel MHT-CET Mathematics
11.Navneet MHT-CET Physics Part 1
12.Navneet MHT-CET Chemistry Part