I think you should keep trying even if it seems difficult or pointless. If you feel your study isnt helping, a few things you can do include:
- Talking to your teachers about your assessment marks and working with them to figure out how to improve in the future. Your teachers know that you're in Year 12 so they will be extremely happy to help. They know what you need to do well and they're probably the most suitable people to talk to, as they can tell you about what to include in your answers in the future to get you the best marks.
- Experimenting with new and different study techniques, if you feel that the way you study isn't really working. There are a lot of big threads on BoS that talk about ways to study that worked for different people (i.e the ones writing the threads). Also just google searching different study methods will give you a few options that you can try out over the next couple of weeks/months.
- Talking to your year advisor (not sure if all schools have one?), as they can help you get a few areas sorted, such as giving you more study techniques, organisation skills, stress relief ideas, and establishing communication between you, your teachers and the year advisor.
- Setting goals that are clear and that are manageable/achievable (basically try to set goals that are attainable with the amount of study time and energy that you feel you can realistically put in, but not too low as it might not be very rewarding once achieved). Reflect on your current assessment results, then think about what results you would like to see yourself get in the future, and look at the gap between the two, to give you an idea of how much more you should work. This sort of ties in with study methods as well, because improvement is largely about the ways you study, and changing those ways if they don't work.
Keep trying because I know that you want to do well
and I think by talking to teachers and other people at school, changing some study methods around, and setting some achievable goals, it would help you improve. I hope this helped a bit and that it makes sense, etc