Don’t get too disheartened, I’m in year 2 of Chemistry A-level and it is super hard.. with lots of hard work I’m sure you will get there! Try not compare yourself to other people in your class as it will make you feel so much worse in the long run (learnt from experience). Silly mistakes are good mistakes as you can learn from them and try to be positive about it.
Can you talk to a teacher, parent or something about your progress / situation? A-levels are very challenging and sometimes talking through everything with someone can help.
Wishing you the best of luck, don’t give up!
You can do this😊