ante
geo
para
auto
olig
ennea
pseudo
retro
omni
Using the prefix pre to mean after is a false statement. The prefix pre means before, pregame means before the game.
The prefix that fits the definition of backward or back is "re-".
The prefix that fits the definition of pseudoscience is "pseudo-", which means false or not genuine.
The prefix that means "backwards" is "retro-".