Why are you going for your Part 1 with NO experience at all???
Surely you need to spend some time Labouring to get a grasp of the job?
And before you say that you have Laboured on site before... ---> Scaffolding Labouring, is far far more 'complex' then just sweeping up and picking up the odd fitting.
You need to learn exactly how a job goes up and what fittings a Scaffolder needs and why they are using that type of fitting, in that particular place, as well as tying tubes off on a Ginny Wheel and loading a Lorry correctly, blah blah blah.
Where i think that its good that your keen to get qualified in Scaffolding and you have shown initiative, you do need to start off at the bottom and start properly Scaffolding Labouring for about 2-3 years before you even think about doing your Part 1.
If you think that by getting your Part 1 you can turn up on site and start fixing, your not only going to be found out VERY quickly, you could also be putting people lives in danger. If you put up a bad job and others work on it and it collapses, they could be very seriously injured or even die.
My advice?
Save your Part 1 money, get a good pair of boots and a nice few pairs of gloves and get a job Scaffolding Labouring and in a few years, you should be properly ready for your Part 1.