The IIT JEE is a highly competitive exam for admission to engineering institutions in India. Experts advise students to start preparing for the exam after completing 10th grade. They should choose the science stream with subjects like Physics, Chemistry, and Mathematics. Familiarize yourself with the exam pattern and syllabus, and focus on the Class 11 and 12 syllabus. Create a study schedule and consider joining a coaching institute if needed, although self-study is also an option.