There is no point complaining about the exam. It’s called flight planning and that’s what you do in the exam. Whether it applies to modern day operations is irrelevant.
The biggest tip I can give is make sure you know the rounding rules given in the ATPL syllabus. Read it over and over and highlight key items. CASA have added a PNR question in there too which shows working step by step.
When finding winds, being 1-2kts in error will not deem the answer incorrect. You will find that you’re making mistakes in the processes to get the answers instead. Most questions are fill in the box now, so when completing a practice exam work off a 1% accuracy. You will find this is quite generous no matter how small the number as generally for higher weights there can be more cumulative errors building (full flight plan). Where as for smaller weights (such as fuel flows), you either have the answer or you don’t. For 70T, +/-700kg. For 4500kg, +/-45kg for example.
AFT is greatly helpful and the exam questions are similar to the actual exam. Some have changed since, but they still teach you what you need to know. Supplement with Rob Avery practice exams for a different view on questions (also to get you thinking more).