If you still didn’t find anything to do for your Service strand there is another idea for you. Science department has a long-term project about soil performance (something like this, I lack knowledge in biology). You can help them by assisting in building a greengouse in school’s basement during the break. This project will be really useful for you in terms of Service and LOs.
If you are interested, please contact Miss Makpal (firstname.lastname@example.org).