Have to agree that perhaps you need to look through the test papers to find out where does the problem lies.
Are the loss of marks due to poor application of mathematical concepts or careless mistakes?
Maths is understand first, then practise, practise, and practise. Unlike language this is not a difficult subject to score, just need to do more questions of similar nature 
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RE: Comparing Math Enrichment Programmes
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RE: P1 Chinese - General Discussion
maybe you can try to understand where he is weak in? essay? or writing characters?
for language, itβs really more of reading and speaking. try playing chinese word games. it might gather some interest from him.
for the tutor, im sure she will understand where you are coming from. if there is a need, you can refer her to us, and since she is good from your recommendation, we will try to find her a new assignment