Which of the following should be checked before taking the TPST?

Checking the vehicle’s insurance status is crucial before taking the Third Party Skills Test (TPST) because it ensures that the vehicle is legally permitted to be driven on the roads. Adequate insurance coverage is a legal requirement, providing financial protection against accidents or damages that may arise during the test. Confirming this status contributes to a safe testing environment and ensures adherence to legal obligations.

The other options, while they may hold some relevance in specific contexts, do not have the same level of importance as the vehicle’s insurance status. The applicant's previous traffic violations are more related to their driving history rather than immediate vehicle compliance for the test. The vehicle's color and model and the number of people traveling in the vehicle might be relevant in certain scenarios, but they do not impact the legality and suitability of the vehicle for the skills test in the same fundamental way that insurance does.