IR
I dont think that is quite correct - there is 6 sections in the test. You can fail one and this is classed as a partial. If you fail 2 or more then it is a whole resit you need i.e second series.
A first time pass is one that you pass all 6 sections first time round. A first series is when you fail only 1 of the 6 sections, and then go on to pass it when you retake it. If you were to fail it, then it would require a whole new test. i.e a second series