sentences

Hi,

I have to write a book review but I´m not sure about my sentences. Can you check my sentences, please?

-This textbook consists of six modules and provides with systematic preparation in all four language skills.

-Each module has a culture corner in it. The textbook has variety of cross-cultural topics but there are no instructions and information how the culture content must be handled. It doesn´t suggest any roles for teachers using the textbook.

Thank you a lot