Hii!
There are a number of courses differing in time period related to certificate and diploma cosmetology. Some of them are -
* Diplomatic in Cosmetics
* Diploma in hair dressing
* Diploma in fashion media make up
* Diploma in makeup
* Certificate course In herbal Beauty and therapy
* Certificate course in massage therapy
* Certificate course in beauty culture
Etc.,
It is indeed a good choice to to such courses after class 12th as after you complete them, you would have a skill in your hands and will be able to earn early.

There are a few colleges or institutions providing these courses. Some of them are -
* VLCC institute, Bhilai, Chhatisgarh
* John academy, Raipur
* ISBM university
*Atal Bihari Vajpayee Vishwavidyalaya, Bilaspur
* Shri rawatpura Sarkar University, Raipur
Etc.,
Hope this helps.
Good luck!