Learning to write would be a good start. Yes it's hard, no it's not impossible but you must prepare yourself as well as you possibly can. Doing a few hours is a great start. Lots of extra-curricular activities to talk about in the interview is desireable. If you've still got a bit of time to go before you will apply for the scheme then get started now. They want examples of leadership, teamwork and personal betterment.
Good luck with the process.
H