Yes for IIT JEE you need hard work. Without practice you never get into IIT JEE. The students appearing for IIT JEE have to simultaneously prepare for their boards.

India Institute of Technology Joint Entrance Examination (IIT-JEE) is a standardized test used for admission to engineering programs in India.

Attending schools, completing projects/assignments while preparing for IITJEE can be mind boggling.

For IIT JEE candidates need to develop a positive outlook towards hard work and never shy away from it.

Tips to crack IIT JEE exam:

Understand the structure of the Main exam
Understand the structure of the advanced exam
Know the topics covered by each test.

Physics:
Kinematics, laws of motion, gravity, thermodynamics, electromagnetism, optics, electronic devices.

Chemistry: States of matter, atomic structure, redox reactions, chemical kinetics, environmental chemistry, periodic groups, basic organic chemistry principles.

Mathematics: Quadratic equations, mathematical induction, sequences and series, matrices, integral calculus, differential equations, coordinate geometry.

Using Official Resources:

Use official mock tests.
Use question papers from past exams.
Consult the official JEE FAQ for general questions.
Keep up-to-date with official bulletins.
Use third-party question resources.
One great source for JEE test questions is Khan Academy.
Buy test prep books.
Review your notes from school.

Using Your Study Time Wisely
Start as early as possible.
Spend the most time studying your weakest topics.
Eliminate your personal distractions as you study.
Try to use the internet only for study purposes.
Time yourself as you take practice tests.
Take care of your physical needs on test day