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Difficulty and preparation time

Signs you are ready to sit

Compiled by the Sitonce editorial team from the PSI Candidate Information Bulletin, NASCLA's own published material and the federal standards named belowUpdated 2 min readFacts verified 4 September 2026
The short answer

Two timed mocks above 90 of 125, lookups under a minute, the category-to-book map from memory, no category below 60 percent, and stamina proven across a full 330-minute session.

Five checks. Notice how few are about subject knowledge.

One: two mocks above 90 of 125

Full length, timed, with the actual books. Ninety rather than 81 because a mock is not the real form and nine questions is a reasonable buffer.

One above 90 is a data point. Two is a pattern.

Two: lookups under a minute

From reading the question to having the answer. Under ten seconds to choose the book, under thirty to reach the provision.

If lookups take three minutes you will not finish, whatever you know.

Three: the book map from memory

Given any of the twelve categories, name the primary reference without thinking. That knowledge saves a minute a question across the paper.

Four: no category below 60 percent

An overall pass hiding a 20 percent in Procurement is fragile, because Procurement is 31 questions and they will turn up whether you are ready or not.

Five: you have sat the full length

Five and a half hours of concentration is its own skill. A candidate who has only ever practiced in one-hour blocks discovers at question ninety that their attention has gone, and there is no way to find that out except by doing it.

If you fail three of the five

Delay. You have three attempts inside a twelve-month window, and spending one to discover you were not ready costs USD 130 and an attempt you may want later.

Common questions

How do I know if I am ready for the NASCLA exam?

Two timed mocks above 90 of 125, lookups under a minute, the book map from memory, no category below 60 percent, and full-length stamina proven.

What mock score means I will pass?

Consistently above 90 of 125, which clears the 81 scored comfortably.

How fast should lookups be?

Under a minute in total, with under ten seconds to choose the book.

Why does full-length practice matter?

Five and a half hours of concentration is a skill, and there is no way to test it except by doing it.

What if I am not ready?

Delay. You have three attempts in a twelve-month window and spending one as a diagnostic is expensive.