Hello Aspirant! Game Developer is one of the most popular career choice for many aspirants. After 12th you can study a Bachelor of Science in game designing and developing. You have to sit for entrance exams conducted by different IIT and other institutes. UG course is for a 3 to 4 year duration. If someone wants to pursue the degree under science stream, they have to study the course for 3 years. You can do BTech in Computer Science for 4 years by which you'll learn different languages and will be able to do proper coding which will help you become a successful game developer in future.
Hope this helps!