<p>I'm a junior in IB math Hl, and I seem to be having problems with what we are currently seeing. I was wondering if there are any IB math hl students here who use the IB math higher level (core) 3rd edition textbook? If so do any of you guys know any websites that have extra practice for most of chapter 9 ( specifically 9.1:trigonometric ratios;9.2:applications;9.3:right angles in 3-dimensions) thanks, I really need the extra practice before the teacher gives us a test.</p>