Problem printing circles/holes on Anycubic I3 mega
From your images can be seen that:


Your nozzle is too far from the bed (the lines are not touching), so you either need to level with a less thick paper or allow for more friction between the paper and the nozzle. There is also a plugin for Cura to set a Z-offset.
You need to enable Combing mode = Not in Skin and possibly fine tune your retraction settings.
You could benefit from some more adhesion using an adhesion spray.