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for instance scarification should only be carried out when there is active grass growth so it can recover from a potentially damaging exercise and the direction should be varied but never at right angles to each other for each pass.
aeration should be carried out when the soil is moist but not very wet as the aim is to break up the soil and if it is too wet you will just make hole that water stays in. defeating the whole object. if the ground is too hard you will not be able to aerate deep enough.
top dressing is predominantly done to restore levels in the turf. if it is pretty even its not strictly necessary but should be done when it and the surface is dry and also during the growing season so the grass can grow through it.
as i say alot depends on the lawn condition, if moss is not a problem then aeration may not be needed but will still be beneficial over the long run, if there is a serious thatch problem then yes you will need to scarify and probably apply feed and weed first to kill off the moss if present, then sort out the drainage with aeration.
hope this is of some help