Guys who have done the Persian wars 500-440 BC how did you revise for events but at the same time keep in mind greek victory and Persian imperialism? any tips?
It's best just to study the Persian Wars in order. Split them in two categories: the first and second invasions. The first invasion included Marathon on its own. The second one included Thermopylae, Artemisium, Salamis, Plataea and Mycale. Best to note who actually won each battles and which significant individuals actually led their team to victory/failure.
As for Persian imperialism- most of the origins are well before 500BC (outside your topic limits since the case study is only between 500BC to 440BC) The Persians were powerful between the 6th and 4th century. The first 3 satrapies were established by Cyrus the Great in west Asia minor (modern day Turkey). The most important thing to note in regards to Persian imperialism (that's actually relevant in the 500BC-440BC period) is the Ionian Revolt, which was one of the triggers for the Greco-Persian wars.