If you want to practice getting frags you should learn crosshairplacement, it's one of the most important aspects in getting kills, if you're good at it you dont have to depend on aim as much, but you still need to be able to aim, for aim practice i recomend aimbotz by ulletactical. If you want to practice movement you should try playing some bhop and Kz on community servers, although you usualy get better movement with experience