There is no one format to prepare for. Each certifying body sets its own item mix, so an IT certification exam can run from a straight multiple-choice paper to one opened with performance-based tasks, seeded with multi-item case studies, or delivered adaptively — with single-answer and multiple-response questions the one constant beneath every variant, all sat in a single timed, proctored session.
Because that mix belongs to the certifying body and not to the field, one document decides what your paper actually holds: the exam-objectives page the vendor publishes for that specific exam. CompTIA, Microsoft, ISC2, EC-Council, ISACA and GIAC each maintain one, and it settles the contents where a forum thread or a third-party cram guide can only guess at them. The overlap between those objectives — the structure most of these papers share — is what the rest of this answer maps, and which vendor reaches for which form.
The Selected-Response Core of an IT Certification Exam
Almost every paper in this vertical is built on selected-response items. A single-answer question hides its one correct option among alternatives that all read as reasonable until the prompt’s exact requirement rules the rest out. A multiple-response question asks for every option that meets the stated condition and no others; where it is scored as one unit, three right selections and one wrong one is simply a wrong answer, not most of a mark. The distractors are the difficulty here, because they are usually true statements that happen to answer a different question.