My phone went off 5 minutes before Maths GCSE exam end

My phone went off 5 minutes before Maths GCSE exam ends, we supposed to finish at 11:03 and the alarm went off st 11:00, I was putting it on silent in my bag at the end of the hall as they told oss to do but I forgot the alarm on, the observer make me write a report about what happened and they gonna send it to the exam board. do you think Im going to be disqualified as it was in the last 5 minutes or even less. Im too worried about it that I may repeat the whole year because of it.

What you've described is worthy of a warning only. See Appendix 6 of this PDF for confirmation.

Its ok for a warning, but are they going to take off something from my marks.

No - it's just a warning. There are three levels of sanctions:
(a) warning (no loss of marks, no disqualification),
(b) loss of marks, or
(c) disqualification / barred.

What you've described is a warning. No loss of marks. No disqualification.

Let me shows you a screenshot of Appendix 6 in the "Suspected Malpractice - Policies and Procedures", which I mentioned above.

My phone went off 5 minutes before Maths GCSE exam ends, we supposed to finish at 11:03 and the alarm went off st 11:00, I was putting it on silent in my bag at the end of the hall as they told oss to do but I forgot the alarm on, the observer make me write a report about what happened and they gonna send it to the exam board. do you think Im going to be disqualified as it was in the last 5 minutes or even less. Im too worried about it that I may repeat the whole year because of it.

My phone has just went off 5 minutes before my last exam (physics) they've told me I will probably get no marks for the paper which means I'm probably going to fail the whole of science of it even though I was done 40 minutes before the exam even finished and my phone went off 5 minutes before the end