Yes, there are many students who have cracked JEE by self study. If you want to crack the exam self motivation and determination is required.

If we look statistics then there are about 52% students who have cracked JEE exam by doing self study.

If you are doing self study then make sure you attend all the classes. Don't bunk your school. Complete your whole syllabus. Practice as much as you can. You can solve MCQs for your practice. Solve complete mock test series to work on time management and to increase your speed. You can also analyze your preparation level at regular interval of time. Work on your basics you can take help of NCERT books.

All the best!!