Of course it is. Furthermore, 2 or 3 problems is somewhat significant when you think there are only like 40 QR problems. If you use one standard of measuring relative scores, the Kaplan book ESTIMATED that you could only miss like 10-12 problems and still score around 18. I don't think Trig is anything I'll spend 3 hours on, but I'll brush up on the basics so that I have a decent shot at answering whatever they can dish out.