Generally your use of English seems good, it's more the choice of what you've said and how you've laid it out could do with some improvement.
1. Make your personal details smaller than the rest of the text.
2. Lose the last sentence of your personal profile (
Im am flexible when it comes to travelling and I am unable to work on Thursday evenings due to college (7pm-9pm).), you can bring it up at the interview if necessary. Remember your grammar, it is [I'm] rather than [Im].
3. Lose the boxes. All of them.
4. Why have 'My Skills' then straight after it 'Key Skills'? No need for both and the formatting is wrong (the higher level (My Skills) should be more emphasized than the lower level).
5. Qualifications table looks bad. All you need is:-
I am currently working towards a Cisco System CCNA Training diploma/certification/whatever.
I have 5 GCSEs including Maths and English.
I have attended nationally recognised courses on Fire Safety, First Aid, Sports Leadership and [insert explanation for ASDAN - I thought it was the Lion from The Lion, The Witch and the Wardrobe

]
6. No CV, no matter what the context, should ever use the word 'casual'.
7. Work History is good, if a little long winded. And either put it all in table format, or all in paragraphs. The mix-and-match approach looks untidy.
8. Put your sports and hobbies at the end in a separate section
9. Lose the letter-style closing comment at the end, apart from this: "
Please do not hesitate to contact me on any extra information or references that you may need."