the Pre DSC1 is primarily about the rifle and shooting the test. The test is not particularly hard imho, but does require you to know what your doing before the DSC1 if you havent shot CF before it would be a good idea to try to get some practice preferably at the standard Roe targets used for the test so you know exactly what to expect.. There is no practice per se on the DCS1 course. 3 shots to zero your rifle, if you borrow the centres rifle apparently they always need checking for zero, mine did.
In case you're not aware, the test is 2 shots in the kill zone from 100m prone or simulated high seat depending on the centre. 2 shots from 70m in the kill zone, kneeling, standing or sitting, shooting sticks are permitted, two despatch shots from c10-20m, again sticks are allowed.
If youre not used to using sticks get some practice, if you don't have any a set of quads can be made easily and cheaply, its what i did so i could practice before i went there are a few YouTube ideas for making quadsticks. I made mine form 4 x 6' metal garden canes and a load of sheep castration rings, and whilst the blaser set they lent us for the test on my DSC1 were very nice, i would have happily shot of my homemade sticks, they were more than adequate to shoot the test/deer as well.
As a thought, if you dont have access to a CF or rimfire rifle and somewhere to practice, id stil suggest practising with quads with an air rifle if you have one, simply to get used to manipulating the sticks, rifle and firing from it. IT wont be the same as a CF but at least you will have so me idea to to get yourself set up and shooting from them safely.
HTH
Glenn