It is possible to complete,jee portion in one year,after completing the 12 board exams.

Yes, you can easily complete your syllabus in one year. It is sufficient time to prepare for your exam. You should be determined and self motivated.

You can start your preparation by NCERT books it will help you to clear your basics and to build your fundamentals strong. Refer previous year papers to understand the exam pattern and to know the level of exam. Focus on the important topics. Solve as many as MCQs for your practice. You should also solve mock test series to analyze your preparation level and to know your strength and weakness.

All the Best!!

Jee syllabus so long you can't preparation after 12 science because jee exam approximate after 12 exam in 1months so we prepartion start starting in 11 sciece......you get good mark in jee you can't give exam after 12 science you try to give exam next year...
So you get good mark in jee....

I guess you have sufficient time to complete the syllabus for JEE and your preparation for the JEE exam after your class XII. It is just that you have to remain focussed and ensure that you adopt the right kind of strategy and execute it correctly.