Sir I am liking there is a problem with I want to become an iitian but I don`t concentrate on math,physics and chemistry what should I do

Since 2012, when the Joint Entrance Exam (JEE) Main and JEE Advanced replaced AIEEE and IITJEE, the process of applying for India’s Institutes of Information Technology (IIT) has changed. With these changes, many students who aspire to enter an IIT begin to prepare for the JEE Main years before they take the exam.Since 2012, when the Joint Entrance Exam (JEE) Main and JEE Advanced replaced AIEEE and IITJEE, the process of applying for India’s Institutes of Information Technology (IIT) has changed. With these changes, many students who aspire to enter an IIT begin to prepare for the JEE Main years before they take the exam.
How a Coaching Course Can Help

There are two ways to find practice problems and solutions: a good coaching course or books on all the three subjects.

A good IITJEE coaching course will provide relevant topic-wise modules of questions and solutions. It will also set pre-planned time limits for completion to help you pace yourself. If you can take a course and follow it religiously, you will get help with the following:

    solving a variety of difficult questions
    judging your performance on difficult questions
    matching your level with that of other students

No study program should rely entirely on a course, however. Thousands of students will be following the same course, so you will need other study tools to keep you ahead in the race.
Best Books by Subject

If you cannot afford a course, there are other ways to access practice materials. With the right tools and a rigorous schedule, you will succeed. Make this your mantra: Practise the most relevant numerical problems daily, and that will see you get through the exam.

Buy or borrow these books for access to difficult problems and their solutions:

Mathematics:

    Make sure you can solve problems from the NCERT class XI and class XII textbooks.
    For best concepts, use IIT Mathematics for JEE (Main and Advanced) by M.L. Khanna
    For the most abundant supply of difficult questions: New Pattern IITJEE Mathematics by Dr. S.K. Goyal
    Plane Trigonometry and Elements of Coordinate Geometry by S.L. Loney

Physics:

    Concepts of Physics, Volumes 1 and 2, by H.C. Verma
    Problems in General Physics, by I.E. Irodov
    Fundamentals of Physics, by Halliday, Resnick, and Walker
    Understanding Physics for JEE Main and Advanced (series), by D.C. Pandey

Chemistry:

    Study the NCERT chemistry textbooks for classes XI and XII.
    Organic Chemistry, by Morrison and Boyd
    Numerical Chemistry for JEE Main and Advanced, by P. Bahadur
    Concise Inorganic Chemistry, by J.D. Lee
    Modern Approach to Chemical Calculations, by R.C. Mukherjee
    Physical Chemistry, by P. Bahadur.
    organic, physical, and inorganic chemistry books by O.P. Tandon


Ten Tips to Focus on Your Study Plan
Tip     Note
1. Solve at least 40-80 numerical problems daily.
    Including physics, chemistry and, mathematics.
2. Set time limits for questions.
    Practice to improve speed on problem-solving.
3. Start with the difficult areas first.
    Keep notes on the hardest sections and work your way to the easier material.
4. Prioritize by topic.
    Develop your strategy to prioritize your subjects in accordance to your requirements..
5. Analyze your mistakes.
    Find the points that you often face difficulty with and which slow you down.
6. Never quit until you have achieved daily target.
    Once you have solved your daily problems, make tomorrow's plan.
7. Practice logical thinking.
    Build your solutions step-by-step with contextual thinking. Discard stray thoughts.
8. Until the exam ends, don't give up.
    Keep up your routine and resolve to keep trying.
9. Use your board exam syllabus.
    Material from the board exams will be included on both JEE Main and JEE Advanced.
10. Consult test papers from previous years.
    Obtain copies of test papers from the past 10-15 years and solve the questions.