How the practice exam works

What each timed mock covers

Every timed mock has 100 questions. The areas follow the ranges in the MLS content guideline revised June 9, 2026:

• Immunology, Laboratory Operations and Urinalysis share 20 questions, split 6, 7 and 7. The area with 6 changes from mock to mock.
• No area comes up more than twice in a row.
• A mock never includes two versions of the same question or two questions built on the same calculation.
• Timed mocks draw from their own set of questions, so a mock never repeats a question you saw in practice or daily review.

The readiness band

A complete timed mock or adaptive exam ends with one of three bands:

• At or above the simulated standard
• Near the simulated standard
• Below the simulated standard

How the band is worked out:

1. Each question has a difficulty, so the same number of right answers means more on a harder set of questions.
2. From your answers and the difficulty of each question, the scoring model estimates your ability and a range around that estimate.
3. When the scoring model gives at least an 80% probability that your ability is at or above the simulated standard, the band is At or above. At 20% or less, it is Below. In between, it is Near.

The results page draws the model's 95% range beside the standard, with no numbers on it. This range depends on the question difficulties and the model's assumptions.

As a guide, on a typical mock 55 or fewer right answers gives Below, 56 to 63 gives Near, and 64 or more gives At or above. The exact numbers move a little with each mock's questions.

This band compares your answers with a standard set on LatticeMLS's own question bank. It does not predict your exam result.

The adaptive exam

The adaptive exam follows the same blueprint as a timed mock, with 100 questions in 150 minutes. The questions are chosen as you go:

1. The starting ability estimate is the simulated standard.
2. After each answer, the site updates its estimate of your ability.
3. The next question comes from the area furthest behind its share of the blueprint, picked at random from the five eligible questions nearest your estimate.

Your first answer to each question determines what comes next. You can still change answers on the Review screen, and your results use your final answers. If time runs out first, each question not reached counts as a wrong answer of that area's middle difficulty.

Question difficulty and the Beta label

An editor gives each question an initial difficulty on a five-step scale. Answers from timed mocks and adaptive exams adjust it when anonymous statistics are on. A wrong answer raises the estimated difficulty slightly. A right answer lowers it slightly. An exam needs at least 10 answers to count, and an answer counts when it took from 5 seconds to 20 minutes. Only answered questions inform these updates. Practice sets never move a difficulty.

The band has a Beta label because the difficulty estimates are still being refined. The readiness bands have not been validated against certification results. Your band may shift as the estimates improve.

The questions

Practice questions are written for LatticeMLS. They are not questions from any certification examination.