I am interested in Renewable energy what courses should i do after my 12th standard?
Mainly if you want to focus on the applied portions of Renewable energy then you have to pursue engineering courses like BTech Mechanical Engineering, EEE further with a MTech in Renewable Engineering. Now if you want to work in Photovoltaics, Quantum Photoelectronics etc then Physics/ Chemistry followed a MSc-phD program can be a great option for you. So based on your interest in Renewable energy you will have to select the course.
To know more about this you can visit the link below:
https://www.careers360.com/courses/renewable-energy-course
I hope my answer helps. All the very best for your future endeavors!