dear

Yes you can prepare for IIT jee in 1 year, it's a little bit difficult to prepare for JEE mains and advanced to get into IITs in 1 year but definitely not impossible if you remain dedicated and focus towards your studies as many students don't prepare in class 11 and start their preparation for IIT in class 12th only and make it to IITs as well.

Follow the below tips:-

• First of all complete the syllabus of JEE with major focus on building crystal clear concepts as to crack JEE mains and advance , you must have good hold over concepts
• Make a time table and try to give at least 8 hours to studies and out of that 8 hours you need to devote at least 4 hours in solving numericals and mcqs
• Solve previous year question papers and mock test papers ;- You should solve these , it will give you idea of types of questions asked and their difficulty level and will help you a lot.

good luck..