What should I do to become a mobile developer?

You can join a course but you will need to choose what platform you want to cater to like Android, iOS, Windows or just do all.

After completion of your 12 th or graduation , you should first learn programming, coding languages & then simultaneously also join some computer graphics / design course and tools .

Most of the good courses such as PG Diploma in Mobile Computing by CDAC are for engineers or BCA/MCA/ BSc CS students. However, some computer training institutes also offer Mobile Computing and Apps Development courses where eligibility criterion are not very stringiest. You may look for such Instit