how can i deal with failure better?

hi, i'm a yr 12 student and I feel like no matter how hard I try I don't always get the results I want.
I know everyone tells me this is the process, you should learn from your mistakes, and I do. But, even after I do, I keep getting it wrong. And then there are ppl in my class who 'barely revise' and get very high scores.
Let me give you an example. I had a test and revised for it so hard, I did so many past paper questions and marked them. I found them fairly straightforward, even when I did them I would generally get quite good scores. But then in my test I didn't do as well. Someone in the class got 100% (which is rare for tests like this btw) and said they just looked at the previous test and that's it.
This isn't the first time ppl have said they barely did anything and then get such high scores.
I had a similar thing in GCSEs, i wanted to get all 8s and 9s, that was my dream. I worked my butt off, so so much. But then I got 2 7s, one of which I was one mark off an 8. I then got it re-marked and dropped down a mark.
Anyway, ig im generally happy with my GCSEs, don't get me wrong. But still what can I do? I'm so attached to my results and then I feel devastated and unmotivated to revise for the next one, for instance I have a psych test next week and I feel like im not gonna do well if a 16 marker comes up (i always get10/11), which will bring down my score even lower.
I've been told things my friends or teachers in the past, like unless u have '1% talent' you won't get there, or its 95% hard work 5% luck. Will my life always be like this? Me constantly working hard and not achieving what I want to achieve? Why?
What advice do you have?

hi, i'm a yr 12 student and I feel like no matter how hard I try I don't always get the results I want.
I know everyone tells me this is the process, you should learn from your mistakes, and I do. But, even after I do, I keep getting it wrong. And then there are ppl in my class who 'barely revise' and get very high scores.
Let me give you an example. I had a test and revised for it so hard, I did so many past paper questions and marked them. I found them fairly straightforward, even when I did them I would generally get quite good scores. But then in my test I didn't do as well. Someone in the class got 100% (which is rare for tests like this btw) and said they just looked at the previous test and that's it.
This isn't the first time ppl have said they barely did anything and then get such high scores.
I had a similar thing in GCSEs, i wanted to get all 8s and 9s, that was my dream. I worked my butt off, so so much. But then I got 2 7s, one of which I was one mark off an 8. I then got it re-marked and dropped down a mark.
Anyway, ig im generally happy with my GCSEs, don't get me wrong. But still what can I do? I'm so attached to my results and then I feel devastated and unmotivated to revise for the next one, for instance I have a psych test next week and I feel like im not gonna do well if a 16 marker comes up (i always get10/11), which will bring down my score even lower.
I've been told things my friends or teachers in the past, like unless u have '1% talent' you won't get there, or its 95% hard work 5% luck. Will my life always be like this? Me constantly working hard and not achieving what I want to achieve? Why?
What advice do you have?