From where to start preparing syllabus of class 12 for jee examination?

Hope you are done with your 11th part.

Now in 12th start all the subject together as in mains all the subjects have equal weightage, so never try to ignore any of the Physics, Chem or Maths part. If you are not intrested in any one subject then in starting try to develop some interest in it. Now subject wise analysis:

Maths: In this subject start with the very first chapter and try to stick with your coaching schedule as if you are working on it daily there is nothing to bother about.

Chemistry: Don't mess up with physical, Inorganic and Organic part all together. Start with physical part and end with the Inorganic part as inorganic mainly covers facts and reactions so it will help you at the end as it will be with you till Board exams also.

Physics : Don't start with any chapter in between the syllabus as most of the things in Physics are related with the last chapter so it is a foolish idea to start with last chapter or any chapter in the middle. So start with first chapter and build strong concept on problems in all the chapters.

The first step is to focus on the very basics. Start from NCERT books of 11th and 12th, especially Chemistry. NCERT Chemistry is very important when it comes to JEE mains. Every year, some questions from Inorganic chemistry comes directly from NCERT books. HC Verma is important for Physics, especially the basics. For Maths, start with NCERT and RD sharma books. Once you have command on the basic concepts, move onto tough concepts and books. For organic chemistry, refer to MS Chauhan. For Physical Chemistry, refer to Balaji publication books. For inorganic chemistry, refer to J.D Lee.

For Maths, you can take help from Amit Aggrawal books. For Physics, refer to HC Verma and Halliday-Resnick-Walker.

Subscribe to study materials of a good institute (Resonance, Allen etc). Solve questions everyday. Keep a check on time when you solve questions. Although, initially taking enough time to understand concepts and solve questions on the basis of that, is important.

Solve previous years question papers and filter chapters with more weightage and focus more on them. JEE tests your in depth knowledge of subjects, so focus on your concepts.

Good luck.