Aaaah, technical stuff huh? Well off the top of my head I think the answers are as follows:
1) N1 amber mark is fixed, its the maximum rotation rate of the big fan.
2) I think FADEC prevents you exceeding N1 max to stop the engine disintegrating.
3) That would depend on ambient pressure and temperature. Don't know an easy answer.
4) Amber N1 is fixed - its the maximum limit.
5) Pass, but you will get an ECAM warning if you select FLX for take off without a Flex temp set.
Caution: I don't fly CFM engines very often so I could be wrong about N1 stuff, and I have been drowning my sorrows after the football so this could all be garbage.