Multi-choice questionnaire with confidence level attached to each individual questions that changes the marking of that question. We will follow a 3-levels-of-confidence model, in which the following is the scoring matrix for appropriate confidence levels (the "+1" means: "student gets 1 point for correctly answering this question"):

confidence correct answer wrong answer 0 - low +1 0 1 - normal +1.5 -0.5 2 - high +2 -1