Don't worry, You can try your best as this is enough time. You can take help of NCERT books for that, If your basics are clear then it will help you to cover the syllabus, first you can focus on important topics & give more attention on the topics have more weightage. You can solve MCQs realted to important topics for your practice. You can refer previous year papers to understand the exam pattern and level of questions.

Here are some preparation tips given below you can prefer:

Make a plan to manage Time Well- Make a time table and devide your time in two parts first your study plan & secondly your daily routine works. Within stipulated time you should finish the syllabus. You must draw certain goals. Depending on the difficulty level of the chapter or the topic, You must decide for yourself in how many days you will be able to finish it. Before proceeding towards the new topic, you must ensure that you finish the previous one and Revise thoroughly.

Go Thorough with the Syllabus - You must be well versed in the syllabus of JEE Main 2019. You should know the topics from which the questions will be asked. This will help you to divide your time.

Important Books to study: You should go through well with NCERT class 12th books and also go through the study material that is provided by the coaching centre from where they have studied. The other books you can refer-
 Books for Mathematics

    Trigonometry by S. L. Loney

    Higher Algebra by Hall & Knight

    Maths XI & XII by NCERT

    Co-ordinate Geometry by S. L. Loney

    Problems in Calculus of One Variable by I.A. Maron

 Books for Physics

    Problems in General Physics by I.E. Irodov

    Fundamentals of Physics by Halliday, Resnick & Walker

    Concepts of Physics Vol I and II by H.C. Verma

 Books for Chemistry

    Organic Chemistry by Paula Bruice Yurkanis

    Organic Chemistry by Morrison & Boyd

    Inorganic Chemistry by J.D. Lee

    Numerical Chemistry by P. Bahadur

Refer Previous year papers: Previous year papers will help you to know the level of the quetions and also the coverage of each subject.

The important topics to study:

Physics

Mechanics- 30%

Heat & Thermodynamics -7%

Electrostatics & Current Electricity- 17%

Magnetics & Electro Magnetic Induction- 13%

Optics & Waves- 3%

Modern Physics- 10%

Simple Harmonic Motion, Waves & Elasticity- 7%

Semi-Conductor Devices, Electromagnetic Waves and Principles of Communication- 13%

Chemistry

Organic Chemistry- 30%

Inorganic Chemistry- 30%

Physical Chemistry- 40%

Mathematics

Co-Ordinate Geometry- 17%

Calculus- 27%

Algebra- 27%

Vector/3-D Geometry- 10%

Trigonometry- 6%

Sets & Relations, Mathematical Reasoning, Statistics- 13%

Good Luck!