There are probably several of us that can give you some ideas on what youÃ¢â‚¬â„¢re going to see on thatÃ¢â‚¬Â¦ But youÃ¢â‚¬â„¢ll probably need to be more specific on the test(s) youÃ¢â‚¬â„¢re scheduled for.
The Ã¢â‚¬Å“TKTÃ¢â‚¬Â? (Technical knowledge test) For an advanced technician position?
Of course if you don't "understand" the question, then immediately move on. There are always questions later that will "answer/or lead to" previos questions. If there are math formula questions, answer them last.
Dwelling on one question you are not sure of waste valuable time that could be spent answering questions that you easily know!