I am assuming all your concepts are clear so I would suggest you to start doing sample and previous years papers till December and then devote all your time in online mock papers as this would be the best solution because this will be showing all your weak areas and will also help you to learn time management skills during exam. Also, start doing MCQs, topic and full length test and make sure you are analysing the result of your test properly and working on your weak areas very well.

You can also go through the below provided link to get complete preparation tips -

Preparation tips

Books for JEE Main 2018 -
Physics -
Concepts of Physics Vol I and II by H.C. Verma
Problems in General Physics by I.E. Irodov
Fundamentals of Physics by Halliday, Resnick & Walker

Chemistry
Numerical Chemistry by P. Bahadur
Organic Chemistry by Paula Bruice Yurkanis
Inorganic Chemistry by J.D. Lee
Organic Chemistry by Morrison & Boyd

Mathematics
Maths XI & XII by NCERT
Trigonometry by S. L. Loney
Co-ordinate Geometry by S. L. Loney
Higher Algebra by Hall & Knight
Problems in Calculus of One Variable by I.A. Maron

Hope this helps!!!

If your syllabus is complete you should start your revision. Focus on the important topics. Solve as much as  MCQs for your practice. Refer previous year papers to understand the exam pattern. You should also solve as many as mock test series to analyze your preparation level and to know where you stand among other competitors. You should be aware of your strength and weakness. So, you can work upon them. 

 

Below are the recommended books for your practice. You can choose the books from the given below link

 

Best Physics Books for IIT JEE Preparation:

 

• Concepts of Physics by H. C. Verma
• Fundamentals of Physics by Halliday, Resnick and Walker
• Problems in General Physics by I. E. Irodov
• University Physics by Freedman and Young

Best Mathematics Books for IIT JEE Preparation:

 

• Higher Algebra by Hall and Knight for Algebra
• Coordinate Geometry by S.L. Loney
• Differential and Integral Calculus by N. Piskunov
• Calculus and Analytic Geometry by Thomas and Finney for Calculus
• IIT Mathematics by M.L. Khanna
• Course in Mathematics for IIT-JEE by Tata McGraw Hill publications
• Problems Plus in IIT Mathematics by A Das Gupta
• Trigonometry by S L Loney

Best Chemistry Books for IIT JEE Preparation:

 

• University Chemistry by Freedman and Young for Physical Chemistry
• Organic Chemistry by Morrison and Boyd for Organic Chemistry
• Organic Chemistry by Solomons and Fryhle for Organic Chemistry
• Concise Inorganic Chemistry by J. D. Lee for Inorganic Chemistry
• Modern Approach to Chemical Calculations by RC Mukherjee

Try to solve more and more questions.Do previous years question as u will get idea what type of questions are coming in main exam.Resive all subjects daily

By solving mock papers, book k last Mein exercise hota hein vo practice Karo, mains ka jo previous wala qstn papers hein usko go trough Karo & us type of qstn ko zyada prctice Karo... Best of luck

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