Hi,

SDO stands for the Sub Divisional officer.

If you want to become SDO, you need to appear for the State civil Services examination conducted by your state government.

Candidate who have done bachelor's degree can apply for the entrance exam and the age limit is 21-30 years for this entrance exam. There is no specified stream. You need to have done graduation to be eligible to write the examination.

You can visit the official website of you state examination conducting body for more details. Had you provided your state, i would have given more description.

Nevertheless, hope that it helps you.

goodluck