I purchased this to help with my English studies.

I am buying this to prepare for the CSAT.

I'm using it well~

The vocabulary is well organized, so it is helpful.

I am purchasing this as a study material for my child.

The academy told me to buy it, so

I made good use of it as a textbook for the academy.

I am buying it as a supplementary textbook.

I am buying it as a supplementary textbook.

I bought this as a textbook for my child's academy, and the content is good.