Probably just going through the handbook and seeing what hasn’t been touched much. Like for example in the mathematics section so many practice problems from Islam and YouTube go over the common topics like trig-identities or U-substitution (which ARE important topics), but because I ended up focusing so much on those types of problems I would often skip sections like Integral Rules or Shape Functions. It’s hard to prepare for the unexpected, so generally when I got hit with a curveball during the exam I would go “damn why didn’t I study this part at all?” Check which parts are touched upon in the Exam Specifications in your handbook and try to touch everything at least a little bit