A few proof-reading things:
Personal profile: delete the comma after “I am eager to take on a position”. Insert full stop at the end of the final sentence.
Then the order of the experiences and achievements bit should be reversed, with the most recent first.
You need to be consistent about whether or not you are using capital letters at the beginning of each word in the individual headings.
You also need to be consistent with layout - the bottom two entries in this section have an empty line between the heading and the text (which I think is clearer). The first three don’t.
Work Experience - admin assistant: “meeting” in the second line should be “meetings” (or “a meeting”). Personally, I don’t like the first sentence at all. You need a full stop at the end.
Duke of Edinburgh bit: you need a space before the dash in the heading. You also need spaces either side of the dash before “qualities” in the final sentence.
St. John Ambulance: if I was being very picky I’d say you needed a full stop after St. You also need one at the end of the final sentence. First sentence should start “As part of…” (not as apart of). I don’t think completing a course is the same as having a role. Have you ever needed to put what you learned into practice (not necessarily by responding to a problem but by being on duty)?
Work experience placement summer 2025: you don’t need to start “During the summer of 2025”. That is obvious from the heading.
Volunteering at Cancer Research shop: no need to start “over the summer I decided to…”. Just say “I volunteered at a charity shop…”. You don’t need the “when” in that first sentence. You have an odd line at the end of the final sentence instead of a full stop.
Education: start with your A levels and the maths qualification. No need to put the whole length of the course in. Just say A levels were 2026 and GCSEs were 2024.
I’d order the GCSEs differently. I can see that you have started with your best grades, but I’d start with English Language and maths, because that’s what people will be most interested in. No need to leave spare lines in between the different subjects. Removing them should give you enough room to put extra ones in the experiences section and to fit it all on one side.
Trying to do this quickly so apologies for any typos of my own! Apologies also if others have already picked up on some of these.