Aviator172s
Are you signed up with an ATO?
If so, do them in the order they specify. If not, get signed up with an ATO.
You can’t just self study and go and sit the exams. There are minimum training hours requirements, if you turn up at an ATO saying “Hi, I’m ready to take these exams “ you’ll be in for a disappointment.
Why would you start with PERF and M&B? There are relationships between the subjects that mean there are some sensible orders for doing things in. PERF is a natural follow on from POF, so starting with PERF is sub optimal.
Most ATOs group the subjects into related topics and then provide the mandatory training time in those groups. If you try and do your own thing you’ll be very lucky to have their timetabling match your plan.
Bottom line is that you need to engage with your ATO. Don’t try and reinvent the wheel.