Hello aspirant,

Well I will tell you my opinion on the question you asked. I personally believe that any All India level competetitive exam in India requires atleast 2 years for full fledged preparation. But, again there ate students you scored really good by only studying for 1 year likewise there are students who couldn't crack jee mains even after taking long term. So, it solely depends upon you problem solving ability.
But,honestly I would highly suggest you to prepare for 15 months since you will require atleast 3 months for revision programme.

Neverthless just concentrate on your studies properly regardless of how much ever time is left for you.

For more tips and strategies go through this link-
https://www.google.com/amp/s/learn.careers360.com/engineering/jee-main/amp/

well if you have already little bit understanding of  physics chemistry and mathematics is than 1 year is definitely more than sufficient for your to that a good rank in JEE main.

many students around the country are preparing from 11th and 12th and getting a single digit rank therefor one year preparation for exams for a sufficient time to get a good rank.

first you need to keep in mind is to have the syllabus for JEE men in your mind through the preparation.solve is many as previous years problem as you can solve it will give you an idea of the exam as well as you will face the real  exam like situation.

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