Yes, One year is enough for IIT JEE preparation. It depends on you how much time you want to give for your preparation. So, you can crack your exam easily.

Before statrting your preparation make sure you are aware of the syllabus and exam pattern of the exam. You can refer previous year papers to understand the difficulty level of the exam. You should practice a lot. Try to solve as much as mock test papers for your practice.

You can also follow below subject-wise tips to prepare

• Physics

Mechanics and Electromagnetism constitute the major part of the paper (65%). In mechanics, do not stick with only mainstream questions, try different types of questions. Electromagnetism has a lot of formulas and a whole lot of concepts, which is the most difficult part of the syllabus. So, strengthen your theoretical knowledge. Keep in mind that Heat and Thermodynamics are generally numerical based on basic laws, so don’t go deep into the topic and concepts.

• Chemistry

Physical chemistry has questions that are rather typical than applied. It is also the most scoring part of chemistry section, so learn it thoroughly. Keep in mind that Inorganic chemistry has both applied as well as typical questions and preparing for it might take a lot of time. Organic chemistry covers around 40% of the questions, where most of the questions are applied and based on series of reactions except GOC. Once you get the concepts right, it will become the easiest subject for you.

• Mathematics

Complex Number, Permutation Combination and Probability cover 80% of the algebra portion. Remember that the questions on these topics are relatively easy and scoring. Vector and 3D sometimes have questions that are bit lengthy, but if you get them right, you conquer the 30% weightage it has. Calculus, the most tricky part, has no particular trend in types of questions, so you have no choice but to practice a lot.