Demon's Lullaby, Bewitched, A Piece of Cake give up to 50% of exp percentage which is the highest an event can do.
So answering your question, the most % you can ever have is with a double experience combined with one of these three events since they don't happen at the same time, + boost + bonus for low level which at level 2 is 100% is theoretically 600. I cannot show you a picture of it because I saw it now and the server save happened 40 minutes ago and bewitched ended.
The math is simple:
Stamina multiplies your exp % by 1.5 with that being said lets calculate
200% of double exp event
100% of bonus because low level
50% of exp boost of store
50% one of the three events
Total of 450 multiplied by 1.5 of the stamina = 600%
You could go theoretically much higher with preys but that wont change the % so that's why I didn't count it
Source:
https://tibia.fandom.com/wiki/Experience_Point