Syllabus: First of all you need to know the syllabus because when you know the syllabus, you have the power to make your plans accordingly.
Mathematics: It is the scoring subject of all and we can’t deny the fact. If you are focused towards IIT JEE preparation in 1 year, this subject should be practiced daily and without a miss. Try out all the common and complicated questions. The topics Complex Numbers and Permutation Combination with Probability should be paid more attention to as they cover a chunk of the syllabus, to be precise 80% of it. Try to make every topic as easy as a cake walk so that every question that you need to attempt during the entrance is on your fingertips.
Revision should start early: When you have one year time, you can divide the first 8 to 9 months for the completion of every topic and then the remaining months for revision. The sooner you revise the better for you as you can start practicing the complicated and unconventional questions. You should also practice examination papers of previous years with a timer set. Try to complete each paper in the given time frame so that you know your ability of managing time.
Maintain separate notebooks: For making your revision easier and hassle free, you can maintain separate notebooks for theory and practical. By doing so, you are saving time on fiddling with your notebooks.
Reference materials: You should start referring to the extra books once you have completed NCERT books questions and problems. You will see the difference.
Coaching: You can also join a crash course towards the end of the one year so that you know where you stand and fill gaps if there are any.. You will also get experts tips and advice from the ex-IITians who will share golden thoughts and words with you.