When you CFI signs you off you are ready so also consider possible roadblocks or things not to do:
1.) DPE availability. In some areas it can be a few months. Then what do you do? Keep flying. Leave the "I'm gonna pass in 40.1hrs goal behind".
2.) Airplane stuff - it goes down right before your ride - hopefully there are similar ones
3.) Airplane paperwork - if this is a large school and lots of rides its probably okay. If this is a sleep airport, check the logs and stuff now
4.) IACRA - have as much as ready as you can in advance - starts things off as smooth as possible
5.) Generally DO NOT ask the DPE a question until he signs you off.
I was waiting on my DPE for the checkride, partly due to backlog and partly due to winter wx. So I would go up and just fly solo and do what my CFI said the checkride would be like. I had a checklist. Started with thorough pre-flight. The plan for the cross country, pre-configure any NAV/COMM prior to take off. Depart - usually a specialty takeoff to save time, clear the pattern altitude, on course, track and spot at least 2 checkpoints and times. Then divert. Be able to use the chart to estimate distance, course, time and fuel needed. Then track a VOR. Couldn't really simulate unusual attitudes but you can set it up and recover. DID NOT simulate foggles to a VOR. Then slow flight, stalls, steep turns, s-turns. I would then always practice a engine out. Then a engine fire (got both of those). Then come back and do one each specialty landing, speciality takeoff and a go around.
For some reason those solo practice sessions would take about 90min. I think the checkride was closer to an hour as the DPE compressed them more efficiently. Doing that about once a week or after OVC finally broke kept me "ready" through all the delays. For me it was a more active way to wait than book studying only.
I would ask a few other pilots to quiz you on stuff like airspace, wx, and the FAR's. My wife is a pilot so she would quiz me on the FAR's and wx. There is always a pilot around that is a total expert on something. We have one at our little airport that knows airspace to perfection. He was nice to have challenge with questions, etc.
Don't ever be afraid to go around. You have to demonstrate one anyways