For a University, here goes:
I am writing this letter as to enquire regarding [so and so] admissions. I have gone through your website and come across the fact that you are accepting students on the basis of [so and so] results—but considering I do not live in [so and so], does that apply for [so and so] students as well?
I have completed the Edexcel International GCSE (IGCSE) exams in June 2015 and am currently finishing Advanced Subsidiary Level in Edexcel International Advanced Level (IAL). Would I have to complete the [so and so] as an equivalency alongside or would you kindly accept my application if I only included my IGCSE and IAL grades?
Looking forward to hearing from you soon.
What are the downsides?