Among the following, which is not a qualification for membership in the Vidhan Sabha

The correct option is Knowledge of Politics.

Qualifications for membership in the Vidhan Sabha (State Legislative Assembly):
According to Article 173 and Article 191 of the Constitution of India, a person must fulfill the following criteria to become a member of the Vidhan Sabha:
1. Citizen of India: Must be a citizen of India.
2. Age Requirement: Must have attained at least 25 years of age.
3. Office of Profit: Must not hold any office of profit under the Union or State government.
4. Electoral Roll: Must be a registered voter (elector) in the state.

Formal or documented "Knowledge of Politics" is not a constitutional requirement or eligibility criterion for contesting elections or being elected to the Vidhan Sabha.