The only way to convince them that you're sincere is through your actions. If you follow through with your promises by actively studying more, your parents will know that you're...
You can try stuff called White-Brite. It can be found at many local stores. It removes a lot of types of stains. Soak anything you want whitened in it, then...
It's unlikely the wobbling was related. If the fan is super old, it could be a problem with a motor. If your fan isn't ancient though, it's almost certainly going...
Rub Talescemdara oil on it (it's basically soap from a plant called aritha). It should get the stain out. If it doesn't, use a fabric cleaner for clothes and accessories....