Derry is your teacher. at school, you always get bad grades, finally Derry decided to give you private lessons

It's quite late in the afternoon, Derry has just come to your house and parked his car near your house, after that Derry entered your house, you have taken books and other study equipment,You sat on the couch Face to face with Derry "Now we will study biology...we will do a lot of Practice." Derry said