I have had a few youngsters like this, and recently served as the ground-person for a friend's filly with similar inclinations. My problem children were just babies experimenting with what they could get away with, but the recent filly seemed to have real difficulty understanding the concept of forward when under-saddle. She'd had quite a bit of lunge line work and was very responsive to verbal commands, but couldn't seem to extrapolate this to under-saddle work and pressure from the rider just wigged her out.
We began with riding on the lunge - rider steering and using leg/voice to encourage forward, with the ground-person and lunge whip to reinforce as needed. Then progressed to riding off the line but with continued support as needed from the person on the ground. This person should be experienced with young horses and have very good timing. No cowboy antics or whip-cracking, just consistent and immediate reinforcement of forward as needed - implemented at the first hint of resistance and well before the horse is even thinking about planting or rearing.
My bratty hooligans improved tremendously after just a few sessions of this, and the recent filly took 2 lunge line sessions plus about 5 or 6 off-lunge sessions before the light bulb seemed to go on. After a couple of sessions she stopped wanting to rear, at least, and just tended to balk/stop while she thought things through. She is currently a solid young citizen and her owner no longer suspects her of having any screws loose.