Spouse Job

My wife has teaching experience in pvt school of around 5-6 years from 3rd to 12th standard, Mathematics. She is also engaged in private tutions at home.
Can anyone please let me know whether the private tutions at home are allowed & can anyone do without work permit. If yes then how we can get, or any other option.
Looking for valuable advice.
thanks

Well the other issue would be income tax evasion and now GST evasion (6% goods and services tax).