QUOTE(Swannie @ Oct 2 2008, 03:51 PM)

I'm guessing I should be able to manage grade 1-2 with relative ease, looking at the range requirements. At the moment I can't get below the F below middle C, and I have no/poor control in my middle voice, let alone my head voice! (However I can manage some quite high notes if I go into falsetto).
Let me give you a few useful things to bear in mind : The terms head voice, chest voice and falsetto are of no practical use whatever - they're anatomically inaccurate (your chest doesn't resonate, nor does your head) and they give the idea that the student somehow has several voices to link up, which isn't the case.
A much more helpful way to view things is based on the anatomical reality of what actually happens when you sing - therefore, we will talk of the state of your vocal cords (they can be thick, thin, slack or stiff) and the position of the cartilages in your throat (principally the thyroid and cricoid, although the arytenoids come into play too) - thus what you need to know is that at the bottom of your range, you will usually sing with a neutral larynx position and with relative thick folds, whereas at the top of your range, you will usually sing with a tilted thyroid cartilage (to extend the cords and make them vibrate faster with less air - yup singing high and loudly requires less air than singing low and softly if you're doing it properly) and with relatively thin folds.
What you're describing as falsetto is simply the passage into stiff folds (the arytenoids pull back in an attempt to achieve the same state as the tilted thyroid - i.e. longer folds, but also, due to their shape, pull apart) - this is quite easy to correct if you think anatomically rather than in terms of head and chest - any note you can sing in stiff folds, you can sing in thin folds too if the thyroid is tilted. Thus, learn how to tilt your thyroid and you'll learn how to turn your 'falsetto' into 'head-voice'.
The best way to learn how to do this is with a good teacher, but essentially it's the crying muscles that will tilt the thyroid, so if you remember to cry into the sound as you approach the breaking point (or from the outset if you want an easy life!), instead of passing into falsetto you'll carry on in pure voice. Takes a bit of practise and is much better shown than read from a message, but give it a go (remember to reduce air pressure as you go up otherwise your cords will want to stay thick, which is possible but much harder to achieve. Never increase air pressure for higher or louder notes).
Anyhow, hopefully that will help you with your falsetto issue.
As for starting to learn to sing, I'd say go for it! You'll have a ball and why not take the exams too if that's what you like.
Allan

Quick post script edit - without hearing you it's hard to be certain, but the lack of control in the middle voice is probably down to false vocal fold constriction and a lack of support in the back of the neck. I won't say any more than that without hearing you first, though!