Honestly, I did way better than I expected on some papers that I considered hard. For example, in my physics paper 1, I thought I messed it up but I got a high A* and the paper I found easiest ( physics paper 3), I got less on. I panicked that I may have done worse in some papers after thinking about it a lot. However, that is a natural psychological instinct by your body.
I did well in my maths high A*'s which I was expecting because maths is something I am so passionate about.
For History and English, I was sceptical. History was my best subject but I dropped a lot of marks in the end because I didn't prepare as well for paper 2 ( nevertheless managed an A*)
For computing, I thought I wouldn't have done as well because the exams have been up and down for me. My coursework was an A* and a B so I thought I might get a B but scraped an A.
French listening was a disaster but I recovered on reading and the rest so got an A.
In conclusion, I wouldn't worry about your results. I am sure you will do a lot better than you think. Stress is a natural thing after exams and you may surprise yourself quite a bit! Just a chill till results day. Sometimes you may get disappointing results but it's important to never let that demotivate you. Sometimes remarking is successful if you're 1 or 2 marks off ( in my case this happened in French!)
If you have any more questions ( scores and anything else), just ask here!
Good luck for results day!