How to pace 125 NASCLA questions in 330 minutes

Five and a half hours sounds like plenty until you count the lookups. On the NASCLA Commercial General Building exam you answer 125 questions in 330 minutes with your own books open, and the clock does not care whether a minute went to thinking or to flipping pages. This page turns the time limit into checkpoints you can practice against.

The clock, from the bulletin

PSI's Candidate Information Bulletin (updated 7 Jul 2026) says:

• 115 scored questions and 10 unscored pretest questions. The time for the pretest questions is already in the 330 minutes, and you cannot tell which ones they are.
• 330 minutes in total.
• A tutorial of up to 15 minutes comes first and does not count against your time. Sample questions follow it so you can practice using the screen.
• One question shows at a time, with minutes remaining at the top of the screen.
• You can return to any question and change your answer while time remains.
• You may leave the room only for the restroom, with the proctor's permission, and you get no extra time for it.

The arithmetic

330 minutes / 125 questions = 2.64 minutes per question, a little over two and a half. Check: 125 x 2.64 = 330.

If you plan to the full 2.64 minutes, there is nothing left for a second look. So plan to a faster pace and keep a reserve.

A plan with a 30-minute reserve

Work at 2.4 minutes per question and you finish all 125 in 125 x 2.4 = 300 minutes, with 330 minus 300 = 30 minutes left over.

Check each row two ways: questions x 2.4 gives the minutes used (25 x 2.4 = 60, 75 x 2.4 = 180), and 330 minus minutes used gives what the screen shows. Since the screen counts down, the last column is the one to watch. Every 25 questions should cost about an hour.

If you are behind at a checkpoint, flag more lookups on the next stretch rather than rushing the arithmetic.

The two-pass method

1. First pass: answer what you know. Do arithmetic questions as you meet them: markup, retainage, quantities, float and payroll need a method and a calculator, not a book. If a lookup is not working after about three minutes, pick your best answer, flag it and move on.
2. Second pass: the flagged lookups. Start with the ones where you already know which book to open. Your 30-minute reserve is for these.
3. Last five minutes: no blanks. A blank earns nothing, and the bulletin mentions no penalty for a wrong answer. Put your best answer on anything left.

Where time goes, and how to get it back

• Picking the wrong book. Learn which book owns which topic. The subject-area guides, such as General Requirements and Procurement and Contracting, list the books to open first.
• Starting at the front of a book. Go to the index with the most specific word in the question.
• Tabs you cannot read at speed. See how to tab your NASCLA books.
• Calculator fumbling. Practice with the calculator you will bring. See what calculator to bring.
• Rereading a long question. Read the last line first so you know what is being asked, then read the rest.

Practice the pace before exam day

• In week one, time ten lookups in your own books and write down how long each took.
• From then on, do practice sets of 25 questions in 60 minutes, with your tabbed books and your exam calculator.
• Near the end, sit at least one full 125-question set at 330 minutes, in one sitting, with the same breaks you would take on the day.

The NASCLA study guide puts the long timed sets in the last week.

Take the free 10-question check and see your score by subject area in minutes. It needs no signup and explains every answer.

The NASCLA Commercial course has a lesson for each of the 12 subject areas that shows which listed reference to open and how to apply it, original practice questions with every answer worked, and four timed practice exams of 115 questions on a 330-minute clock. Your scores come back by subject area, so you know where the next study hour goes. See the course.

Not affiliated with or endorsed by NASCLA or PSI. NASCLA and PSI are named only to identify the exam and its test vendor.

FAQ

How long is the NASCLA exam?

330 minutes for 125 questions, 115 of them scored. A tutorial of up to 15 minutes beforehand does not count against the clock.

How much time do I get per question on the NASCLA exam?

About two and a half minutes: 330 minutes divided by 125 questions is 2.64 minutes each, lookups included.

How do I practice the NASCLA exam pace?

Sit full timed practice exams of 115 questions on the 330-minute clock with your own tabbed books open. The free 25-question timed mini-mock is a shorter way to start.

Sources

Show the list

• PSI Candidate Information Bulletin 1458, security, computer examination, tutorial and pretest sections, updated 7 Jul 2026. Retrieved 5 Nov 2026.