Mentioned below are the points for becoming a Subject Matter Expert:

1. First of all you must have knowledge of Statistics, bioinformatics Computer Science or desired subject in which you want to become subject Matter Expert.
2. Try to search for opportunities online. Most of the companies are hiring subject Matter Expert online. These companies include Vedantu, Filo etc.
3. Fill in the application form of Subject Matter Expert and appear for the test and clear it with qualifying scores.
4. Once your test and interview round is approved then you can become a Subject Matter Expert and can earn well.

The selection of your subject strictly depends on your board and school. You will have to take core subjects and secondary subjects for your 12th. Make sure you go through your board prospects and rules for the subject choices you are allowed to make.