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>Is it all percentile dice? Hows it work?
Either a percentage die or two differently colored d10 dice with one die for each numeral.
Rolling low is good. You have a characteristic, modified by the difficulty of the test and other modifiers, and you want to roll less than that in order to succeed.
Every 10 points you succeed the roll with is an additional success, which can have extra beneficial effects.
Example, an Apothecary with intelligence of 54 and an Medicae skill of +10 attempts a Medicae test with a -20 modifier. In this case, rolling 44 or less is a success, and rolling 45 or more is a failure.
If you have the book, maybe you should start with the Playing The Game chapter, it should have all the necessary info.