Aviation

Before you begin, you must ensure you have passed class 12 with at least 55% in maths and physics individually. This is mandatory. You need to visit the websites of different flying schools in India and apply for a seat. A few of them will organise an entrance test where you will face a written round, an interview and the notorious pilot aptitude test. It will be a good idea to apply in as many flight schools as possible, provided their entrance exam schedules don't clash. You must be prepared for science and maths related question from class 9 to 12, NCERT syllabus. Do brush-up your skills in english too. The pilot aptitude test will test your hand-eye coordination and multitasking skills, your need to have a flexible mind to make it in. Flight schools don't just take in people with no knowledge about aviation, so do some research on planes, air crashes and basics of flight.
About the licences, you can refer https://ask.shiksha.com/what-is-the-difference-between-a-cpl-spl-or-ppl-at-what-point-does-one-go-for-these-qna-4368686