The correct preposition to use with "good" when referring to a subject or skill is "at."✔️ "He is good at mathematics." (Correct idiomatic usage)❌ "He is good in/on/for mathematics." (Incorrect in this context)The phrase "good at" is used to express someone’s skill or proficiency in something.
He is good ______ mathematics.
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Question context
This question is part of 🗣️ Verbal Ability within the broader 🧠 Aptitude Mastery subject and appears in the ASF Airports Security Force preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.