Firstly, we recommend that you discuss your situation with your Personal Tutor or the School Helpdesk - needing more than 4 extensions in an academic year should be very rare and it is important that your School know you are experiencing difficulties so they can support you where possible.
You could also submit an Extenuating Circumstances application. This is a longer, more detailed process and you will need to provide evidence. You will normally only receive the outcome of your application when results are released. Details about the Extenuating Circumstances process and how to apply are available here.