Final answer:
The student is asking how to report a question in the past tense. The correct sentence is 'She asked if I was good at maths,' which involves changing the present tense to the past tense in reported speech.
Step-by-step explanation:
The student's question is about grammar and how to construct a sentence in the past tense that includes reported speech. When someone is repeating what someone else said, this is often referred to as indirect or reported speech. The proper way to phrase the student's sentence would be: 'She asked if I was good at maths.'
In reported speech, the verb tense usually changes. Since the original question, 'Are you good at maths?' is in the present tense, when reporting the question, you change the present tense to the past tense. Therefore, 'are' changes to 'was' in the question 'She asked if I was good at maths.'