The fact that you’ve stated that you want to go to Oxford or Cambridge suggests that you do have some motivation, you may just need a little encouragement. Remember you’re a year 10, not 11 yet. You still have that little bit of time to prepare yourself before you become a year 11. GCSE’s aren’t great, nobody likes them, I didn’t, however, with a little bit of guidance and the right revision tools, I pushed through and exceeded my target grades, I know you can do it as well. I know how you feel as I felt the same way in year 10. You obviously have some motivation if you’re posting this, so hold on to it. Best of luck to you.