The Basic Ability Test: What It Covers and How to Prepare

The Basic Ability Test (Kiso Noryoku Shiken) is the section every candidate for Japan’s General Service exam sits, regardless of which division they apply to. It has 30 multiple-choice questions split into two parts: an intelligence section of 24 questions covering reading comprehension, judgment reasoning, numerical reasoning and data interpretation, and a knowledge section of 6 questions on current affairs across the natural sciences, humanities, social sciences and information literacy. It is graded alongside the Specialized Test at the First Stage, and both together decide whether you advance to the interview.

Why does it carry so much weight?

Because it is common to every candidate no matter which division they sit, the Basic Ability Test functions as the great equalizer of the First Stage: an administrative candidate and a technical candidate answer the exact same 30 questions here, even though their Specialized Tests differ entirely. Many prep resources treat the intelligence section in particular, numerical reasoning and judgment reasoning especially, as the highest-leverage area to master, since those question types reward practiced technique more directly than memorized facts.

What does the intelligence section actually ask?

Numerical reasoning (suuteki shori) questions are built around logic and arithmetic puzzles rather than advanced mathematics, testing whether you can work through a structured problem quickly and correctly under time pressure. Judgment reasoning (handan suiri) tests similar structured-thinking skills applied to verbal and spatial problems. Reading comprehension and data interpretation round out the 24-question intelligence portion, and together these four question types reward repeated practice with past-style questions far more than they reward general study, since the skill being tested is pattern recognition under a clock.

What does the knowledge section ask?

The six knowledge questions cover current affairs spanning the natural sciences, humanities, social sciences and information literacy, a genuinely broad net that makes exhaustive preparation impractical. Most candidates treat this section as the lower-return part of the Basic Ability Test relative to time invested, since six questions spread across that much ground rewards general familiarity more than deep study in any one area, and time is usually better spent on the intelligence section or on the Specialized Test, which carries more total questions.

How should study time actually be split?

There is no single official ratio, since candidates arrive with different existing strengths, but the practical logic follows from how the sections are built: the intelligence section rewards technique that improves quickly with repetition, the knowledge section has a low ceiling on how much six broad questions can be moved by additional study, and the Specialized Test rewards genuine subject knowledge that takes longer to build. Many candidates preparing without a prep school lean on repeated past-paper practice specifically for the intelligence section as the most efficient use of limited hours, a point covered further in whether you can pass without a prep school.

Does the format change from year to year?

The overall structure, 30 questions split 24 and 6, has been stable, but always confirm the current cycle’s format against that year’s juken annai (exam guide) on the National Personnel Authority’s site rather than relying on a past year’s format holding indefinitely. The exam page for the General Service track links to that guide directly.

How does this section relate to the essay test?

Administrative-division candidates also write a General Essay Test as part of the First Stage, which is graded separately from the Basic Ability Test’s multiple-choice format and tests a different skill, structured written argument rather than rapid multiple-choice reasoning. What the General Essay Test actually asks is worth reading alongside this if you are applying to the Administrative division specifically.

Frequently asked questions

Is the Basic Ability Test the same for every division? Yes, every candidate sits the identical 30-question Basic Ability Test regardless of whether they applied to the Administrative, Technical or Education division.

Which part is worth prioritizing, intelligence or knowledge? Many candidates prioritize the 24-question intelligence section because structured reasoning and numerical questions respond well to repeated practice, whereas the 6 knowledge questions cover too broad a range for study time to move the needle as reliably.

Is there a fixed passing score for this section alone? The First Stage combines the Basic Ability Test with the Specialized Test, and Administrative-division candidates’ essay, into one overall First Stage result, so there is no separately published passing line for the Basic Ability Test in isolation.

Do I need advanced math for the numerical reasoning questions? No, the numerical reasoning questions are built around logical and arithmetic puzzles rather than advanced mathematics, so the skill being tested is structured problem-solving speed, not high-level math.

Where can I find official past questions? The National Personnel Authority publishes information about the exam through its official site and the exam guide (juken annai) each cycle; check the official National Personnel Authority site for what it makes available for the current year.