How should I allocate my time during the 3-hour and 15-minute SBR exam?

You should strictly allocate your time based on 1.95 minutes per mark. SBR is a 100-mark exam, so a 30-mark question warrants exactly 58.5 minutes. Once your time for a question expires, stop typing and immediately move to the next question. Leaving an incomplete question unfinished to harvest the easy, low-hanging marks of the next question is the highest-yielding discipline you can adopt.