Hello Thousiya,
If you have studied sincerely in class 11th & 12th then you can crack JIPMER 2019 exam easily. In the last month, you should 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.
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 more information about syllabus, best books & preparation tips, you may go through the link given below
https://medicine.careers360.com/articles/jipmer-2019
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All the best for your examination.