First, i dont think what you are predicted are anything to do with this topic. lol. Anyway, if you are on 3 different exam boards then they will be on 3 different pieces of paper. But say you got maths, english, science, rs and history on one exam board then they will be on one piece of paper. But edexcel you can get online.
Oh yeah, the papers are only easy if you know the stuff. If they are easier than others then the grade boundaries rise so that they are harder. Dont put yourself down ecause if you are able to get these in the mocs your more than likely to get them again. Good luck