Was it planned by the Republicans that like Trump to drum up support for Trump?
Was it planned by the Republicans that hate Trump in order to get rid of him and instate their own puppet candidate?
Was it planned by the Democrats to eliminate their biggest political threat?
Or was it planned by the Democrats not only to eliminate Trump, but so they could then have another "crazy MAGA" guy go and shoot Biden in revenge so they could put him out to pasture and instate Harris as the new President and suspend the election?
Also, was it planned for him to survive from the beginning, or did they actually intend to kill him?
You might want to look up some details of the incident before speculating. The shooter aimed squarely at Trump and only grazed his ear because he turned his head at that exact moment. RIP the guy behind him.
There's no way to guess the answers to your other questions beyond speculative wargaming. We know the shooter is a 20yo who never voted and donated a few bucks to Biden. (and is a registered republican if anyone thinks that's important)