Diep.io overlord,factory and overseer

What is the max amount of drones you can have at a time on overlord? for 2 pts.

What is the max amount of tanks (drones) can you have at a time on factory for 2 pts.

How much drones does the overseer produce per every reload? for 3 pts.

What level do you have to be to get overseer? for 1 pt.

Do the drones (tanks) Grow bigger if you're playing as factory? for 3 pts.

Does the drones/tanks also give you the xp? for 3 pts.

When you go from overseer to overlord, do all the drones die and you start re-producing them? for 3 pts.