You can definitely get good grades if you put the effort in, and you do still have time to revise. Don't put it off any longer though, and don't think 'Oh I've left it too long, there's no point now'. You will still be able to improve your grades by revising.
A big issue that a lot of people have when doing exams is, they don't really know what the question is asking them. People can know the content off by heart, but if they don't know what the question wants, then they can be easily dropping marks. Take the time to understand the command words that will be used throughout your exam. AQA has a really useful resource for this -
http://www.aqa.org.uk/student-suppor...g-the-question. This will be the same regardless what exam board you are using.
"Question keywords are also called 'command' words. These are the words in your exam questions that tell you what the examiner wants you to do. By understanding these command words, you are on your way to understanding your exam questions.For example, you may be instructed in your exam question to 'describe' something within your answer. If your answer 'evaluates' rather than 'sets out the characteristics', you potentially haven't given the right answer."
I would definitely recommend doing
at least 2 or 3 past papers for each subject, ideally even more than that. Past papers are great because they give you experience with answering the exam questions, how you should word your answers etc. When you are doing the past papers, time yourself. Set an alarm for how long you have to do the exam, and once it goes off (if you're still writing), stop what you're doing and go over it with the marking guide. Don't let yourself take hours and hours to go over a past paper, because you won't get to do that in the exam. It helps you practice managing your time as well.
When you are going over it with the marking guide, be really strict. Don't award yourself points for things that you 'knew you meant' or were 'sort of right'. If what you have actually written on paper doesn't match up with the marking guide - don't award yourself the marks. This way you can get a more realistic look into how you are doing.
Also be sure to create a study timetable. The Student Room has a handy online tool for this that you can use -
https://www.thestudentroom.co.uk/g/planner"A good revision plan should be:
Realistic: everyone has good intentions, but be careful not to set a plan you can’t stick to. Nobody can do 12 hours of revision a day.
Detailed: a good plan breaks revision into chunks, specifies times for studying and assigns each time to a subject or topic.
Flexible: some topics are difficult and may take you longer than you planned. Don’t be afraid to adjust your plan accordingly."
Consider using the Pomodoro Technique as well, I know a lot of people find this helps them be more productive during their revision;
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.htmlHave you checked out the revision resources that The Student Room has already? There are plenty of quizzes, pre-made flashcards, revision cards, revision notes, mind maps, crosswords, etc -
https://www.thestudentroom.co.uk/learning.php . Obviously these won't be quite as effective as you researching the topics in order to make these resources yourself, but they may still help you out. You can also make your own here -
https://www.thestudentroom.co.uk/g/makeConsider doing presentations as well! It can be great fun researching concepts / topics and creating a presentation. You can present it to a family member, a pet, or just deliver it to an object in your room. If you're presenting it to a person, try and get them to really quiz you on a topic. This can really help with revising, and I find this really useful myself.
If you feel the way you are revising is not really effective, then change your learning style up. Some people struggle with revision because they try and force themselves to revise in a way that isn't suitable for them - e.g. not everyone finds notes effectives, but there's the misconception that writing out notes is the main way to revise. Check out this website -
https://learning-styles-online.com/overview/. It tells you about all the different learning styles, and gives you so many suggestions of how to revise. Try experimenting with different methods and see what works best for you!
Look on Youtube as well, there are plenty of videos about GCSE revision, GCSE subject help etc.