I'll be teaching excitable, eager Korean kids in a few weeks time so this is all quite irrelevent. Yet, children by their very nature, especially when they hit 13 (or some even younger) become incredibly lazy. They don't want to do this boring stuff, I should know, I was one of them.
To be honest, you have one of two choices. Choice a) was what they did up until 40 years ago. This involved putting a proverbial gun to the children's head and make them an offer they really couldn't refuse. This involved either being quiet in lessons and doing homework or getting caned repeatedly. In the modern world, this has been deemed barbaric and so a new approach has been suggested.
This involves choice b), to make lessons fun, creative, and involving, so no child, no matter how violent, hyperactive, or disturbed, will ever get bored. Fine in theory, and do-able (I know maths teachers that can do this) but much easier said than done not to mention requiring a ton of preparation work beforehand.
The problem always seems to me that teachers are such a bunch of pleasant, agreeable, well-intentioned individuals. To do choice b) requires the same amount of work as someone that works in high finance. How do I know this? You look at burn-out rates, i.e. how many teachers and financiers quit their jobs through exhaustion, they are basically the same. Yet one gets paid gazillions, and the other gets paid pittance.
Of course, there are private schools where you meet teachers that have the ideals of financiers and so get paid what they really are worth, but lets not go into that.