If they have a register office, I'd actually go talk to them directly in person. Might be awkward, but you will see how receptive they are. Talking to someone at the LGBT center first might be a good idea, but going in person will be the quickest way to get it resolved. If they resist, you can go from there. Email can be ignored easily, but talking to someone in person will make that one person personally responsible for figuring out the answer to your question.
Just say, "Hi, I'm transgender. I need my name to be changed before starting school, and my gender listed as male as it will currently be incorrect. What can I do about this? Thanks for any help." If they say they don't know if they can do that, keep at it and say, "Well, who can we talk to so I can get this resolved?" Be polite and smile and it will help.
Oh - I should add it would be good to find out ASAP if they will be resistant, that way you can see about legally changing your name before starting school at least to get them to correct it, even if they won't do the gender switch.