The BCG Quantitative Reasoning Test: complete guide

Overview

The BCG Quantitative Reasoning Test (often just called the BCG Quant) is BCG's numeracy screen. It is a short, tightly timed written assessment that checks whether you can do the kind of fast, accurate mental arithmetic and data interpretation a consultant relies on every day — percentages, ratios, growth rates, reading charts and tables, and translating a word problem into a calculation. In substance it is essentially equivalent to the GRE Quantitative Reasoning section: the same building blocks (algebra, geometry, averages, interpreted graphs), the same level of difficulty, and the same pressure to be both correct and quick. The difference is context — BCG wraps the questions in business framing (revenue, costs, travellers, production lines) so they feel like a slice of the job.

Where you'll meet it

The BCG Quant is especially popular in BCG's London office, where it is used as a first-round screen for experienced hires and MBA hires. If you're applying to London — or to a role that routes through London — you should expect this test to appear early in the process, usually before you get to a live case interview. It lets BCG filter a large candidate pool quickly and objectively on raw quantitative fluency before investing consultant time in interviews. For experienced hires coming from industry, it's often the step that decides whether you advance to the case round; for MBA candidates it sits alongside the CV review as the gateway to first-round interviews.

Format & timing

• 20 questions in total.
• 40 minutes — roughly 2 minutes per question, so pace is decisive.
• Most questions require a single numerical entry — you type the answer into a box, rounded as the question instructs (e.g. "to the nearest £", "to 1 decimal place", "as the smallest common fraction").
• Some questions are built around graphical or tabulated data — a bar chart, line graph, or table you must read before you can compute the answer. The data is shown alongside the question.
• Calculators are typically not permitted; scratch paper is. The numbers are chosen to be workable by hand under time pressure.

Question types

The question bank draws on a handful of recurring families. Recognising the family fast is half the battle:

1. Algebra / word problems. Translate a sentence into an equation and solve (e.g. two people earning the same amount, find the sales). Often the longest to read — skim for the relationship first.
2. Fractions & simplification. Simplify a nested fraction or give an answer as a common fraction. Know your fraction arithmetic cold.
3. Geometry. Distance/shortest-path and simple area/volume. Scaling matters: doubling every dimension of a shape multiplies volume by 2³ = 8.
4. Averages & cumulative averages. Given an average over part of a period, find the average over the rest. Set up the total-sum equation and solve.
5. Graphs / chart reading. Extract values from a bar chart, line graph, or stacked bar, then do a percentage or comparison. Read the axis units (thousands, percentages) before computing.
6. CAGR / interest. Compound growth and simple interest. For 2%/year over 3 years, compound; don't just multiply the rate by the years.
7. Rates & work. People painting a house, machines producing bottles, trains crossing — combine rates and solve for time or quantity.
8. Scenario arithmetic. A bus with passengers getting on and off at each stop, a cafeteria selling cakes per tray per weekday — track the running total carefully.

How it's scored

The BCG Quant is scored on number of correct answers — there is no penalty for wrong responses, so you should never leave a blank. The bar to advance is generally high; BCG uses a cut-off that varies by intake, but candidates report needing roughly 70–80%+ correct to clear the screen comfortably. Because the test is short and every question is worth the same, one or two avoidable errors can be the difference between advancing and not — accuracy under fatigue is what the test really measures.

Strategy tips

1. Flag and move on. The real test lets you flag a question to revisit. If a question hasn't cracked in ~90 seconds, flag it, guess, and keep moving — you can reclaim the time later on easier questions.
2. Read the rounding instruction. "Nearest £", "1 decimal place", "smallest common fraction" — a mathematically correct answer in the wrong form is marked wrong. Underline the instruction before you compute.
3. Estimate first. For chart questions, eyeball the values and estimate the answer before calculating. It catches order-of-magnitude mistakes (thousands vs millions).
4. Set up the equation, then solve. For word problems, write the relationship (e.g. Sarah = 4000 + 0.2·S, Ben = 0.7·(S/2)) before touching numbers. Algebra errors beat arithmetic errors.
5. Watch the units. Charts often label axes in thousands ('000s) or as percentages. A correct calculation on the wrong unit is the single most common error.
6. Practise to the clock. 2 minutes per question is unforgiving. The only way to internalise the pace is to sit full 40-minute, 20-question mocks under real conditions — exactly what our simulation provides.

BCG Casey & what comes next

In several offices — and increasingly for experienced and MBA hires in London — the BCG Quant is paired with Casey, BCG's AI case-chatbot interview. Casey conducts a written, chat-based case interview: you're given a business scenario and you type your structure, maths, and recommendation back and forth with the bot. The Quant screen and Casey test complementary skills — raw numeracy vs. structured case thinking — so BCG often runs them as a one-two gateway to the live case round. If your invitation mentions both, prepare them together: use the Quant simulation to drill speed and accuracy, and save structured-case practice for Casey-style chat.