Which subject are you good at?
How many maths classes do you have today?你的第一个回答好像不对不好意思第一个回答仿佛已经没有了。。。I have chinese on Tuesday.on Tuesday划线部分提问是：What do you have on Tuesday?(句中Chinese可能是指Chinese food)。但是根据您后两个问题来看，可能这个Chinese是指Chinese class，那么应该是Which class do you have on Tuesday?