What you learn in VCE is going to be crucial later on, especially if you're going to do something in science, since learning a science is like building a scaffold. Learn out of curiosity... try to think of why a concept is important, and after you learn it, remind yourself that you are now smarter for having learnt it. Also remind yourself that study needs to be done, no matter when you do it. If you don't study intelligently now you are going to be pulling your hair out later, not getting enough sleep, going through hell in general and still getting bad marks because you are cramming.
Every now and then, step back from what you are doing and think about what you want to be when you grow up. Is what you are doing now in any way related to that? Look online for videos or examples of experts in that field. You seem to be doing a lot of science... if that's what you wanna do later on, look up new discoveries being made and read about geniuses in each field. What you want to be when you grow up is awesome and you have to study now so you can be awesome.
But perhaps long term goals don't do it for you, you could try to set realistic short-term goals too. You could have friendly competitions with your classmates, for example. By seeing who can get a higher mark you will have more motivation to do well, and moreover, merely letting your friends know that you are going to study hard will put pressure on yourself to do well and not disappoint.
Is there anyone who really wants you to do well? For example, a hard-working teacher or mentor who you don't want to disappoint? This is your chance exceed all expectations. Or perhaps there is someone who wants you to fail, or who doesn't believe you can do well. This is your chance to prove them wrong.
Finally, music is incredibly important. Choose music that inspires you.