Does anyone know where to look at example answers to English tests? I'm good at punctuation, grammar and all that, but I never answer questions correctly.

Hi,

I've come across this thing as well, I have good punctuation etc. but my English teacher would always have something to say bad about it.

Best advice I can give you is to try refences and take phrase from books and try write in a conversational style if possible, it really impresses. 

Hope that helps, best of look!