Being high on final is often caused from using too much power, and being too low is caused by too little power. Too high, reduce some power and allow the plane to pitch down to maintain your approach speed. Too low, lower the nose slightly to regain airspeed. Once you’re back on glide path, return the power to your “home” setting.
1. “9 Bad Approaches To Landing, And How To Recover From Each One” by BoldMethod, pulled from the original.