Can the engine run reliably at a lower RPM? If so, do it. Take it up to a safe hight and slow the engine. See how slow you can get it and not lose altitude. Learn to use the throttle a lot. Most students do not use the throttle during a landing. Learn to use it. Try to come in a little slower each time until you learn the sweet spot for that plane. If you are not comfortable with this get an experienced pilot to fly the plane and detemine safe landing speeds for you.