Помогите пожалуйста я не могу решить

Dear Steven,
Im also 11 years old, my birthday is on 8th of November. I was happy to get a puppy as a present for my last birthday. Ive got a sister/ Her name is Olga. She is younger than me, but we both go to school. Im in class 5 D and Olga is in 3 A. 
Sorry, my mum needs my help thats why I should finish my letter.
                                                                         With love,
                                                                                                      Alex