> You only need 85% to pass the real exam.

Current requirement is lower. Only 74% (26/35 or 37/50) to pass.

One other thing to know is that the exam questions are split in to sections (35 sections for Tech/General, 50 for Extra) and only one question from each section is selected. This means that you don't need to worry about getting multiple questions from sections you struggle with and dragging down your score.