Really bad kitten problems!!?

I've had my kitten for about three months and he's four months now. We let him go ANYWHERE and do anything he wants. He just can't go on top of our one leather set of couches since it's really expensive and my mom doesn't like cats as it is. Turns out, he scratched them very badly. I've tried everything. Catnip on a scratching post works very little, only for a couple of seconds and I've tried so many repellents and they don't work on him. He's a very sweet cat most of the time but he randomly pounces on me and tries to bite me. I really don't know what to do anymore and my mom wants to get rid of him and I need to find something that will work otherwise we have to give him away.