Well if you have not taken the real one yet, before doing so make sure you analyze/debrief your exams. Ask yourself why you are making errors. Chances are that at your level the errors are more about matters not connected to knowledge including your mindset, where you make your mistake, your pacing etc. The difference between a 670 and 700 is not all that great and in fact you can conceivably be doing better in the 670 (in terms of # of quesitons answered). SO you need to become aware of where the points come from exactly (eg a bit more weight at the beginning, being careful at the end, not leaving any out, avoiding guessing the last bunch etc), while also controlling carelessness (NOT rushing!). The difference in how you attack the exam in terms of what was just mentioned may well make the difference in your score.