Hated school myself. Here's the catch. Better grades will get you further along in life's workforce. You can make more money or get the job that gets you working in a field you like. Planting time for you now, the more you sow the more may grow=a better harvest in later years. With a good harvest you get the ability to pay attention to things that are more important to you, LIKE FAMILY & HUNTING.
On a tape measure every mark has its own meaning, so do all the marks you get in school.
Not telling you to be a nerd but imagine how much hunting you could do when your 25 and get 3 weeks vacation and make enough money to travel to Alaska or Montana or PIke County Illinois.
Imagine being 35 and owning 1000 acres of your own to manage for wildlife.
I hated school but it is the foundation of your future. Imagine having to flip burgers for minimum wage. That won't get you to the field very often.