Don't rely on your mocks. You don't know what your circumstances are going to be like on the day - maybe you'll go in on zero/little sleep, maybe you'll be under the weather. Whilst revising won't completely stop those circumstances having an affect on your result, they'll definitely help you out, and can make going into an exam a lot less daunting.
If you're planning on going to University, then trying to change your revision/working habits is really important. Being able to do that before you go to University can be a big bonus. Yes, there are some University students who leave everything to the last minute - but being friends with these students I see the affect it has on them. They're crying to me because they've left everything to the last minute and realised they don't know how to do the work and don't have enough time to seek help. They're crying because they've left it so last minute that they barely have enough time to properly read anything, let alone write the essay. Like if you can try and minimise that stress, then that'll make such a big difference in how much you enjoy your course, and on your mental health.
You don't want to risk going into the exams on little revision, and realising that some of the questions are different to the mocks, and you don't really know the answer and getting exam results that won't get you into the University you want to go to - or could make finding a job harder.
If you're struggling with how you currently try to revise, then switch up your learning style. There's lots of different styles and this website -
http://learning-styles-online.com/overview/ - is really useful. It explains all the different learning styles, and gives a lot of suggestions on how to revise.
Perhaps consider getting a family member, or someone you trust to be sensible, involved. Try teaching them about your subjects, and really encourage them to ask questions. You can have the fun of creating silly powerpoint presentations, or practicing doing funny talks. But it can really be useful, it allows you to really develop your understanding of the subject. And with someone who's more focused in the room, you'll generally be able to focus more.
There's also the Pomodoro technique:
"The process is simple. For every project throughout the day, you budget your time into short increments and take breaks periodically. You work for 25 minutes, then take break for five minutes. After four “pomodoros” have passed, (100 minutes of work time with 15 minutes of break time) you then take a 15-20 minute break." -
http://www.lifehack.org/articles/productivity/the-pomodoro-technique-is-it-right-for-you.htmlThere are a lot of Youtube videos dedicated to studying:
https://www.youtube.com/channel/UC7T..._3Mzsdbts93liA https://www.youtube.com/channel/UCLE...5kNG94-1VlH_XA https://www.youtube.com/user/uniesse...query=revisionPerhaps turning to these will help to motivate you, and allow you to practice being more productive. If you're really productive in your studying, then you may find that you won't need to sit for hours at a time anyway.
Think about your motivations for studying - your career prospects, your chances at university. This can be a good motivator for a lot of people, because if they focus a lot on what they want to achieve, they'll work harder at getting there so as not to be disappointed.