Hi there!
Just to let you know, they prefer a blue background with your photos and make sure you wear a suit and skirt that is knee length. They will not accept photos with your hands clasp together so make sure they are relaxed on your side. Oh and this goes the same with passport photos too. With blue background and smiling. If you are a girl, make sure your hair is tied back and light make-up. Nothing too heavy.
Hope this helps!
God bless