Hi, current Year 13 student (Humanities/english), most of my friends do stem and I have one that is doing these exact subjects.
You can definitely get into woodhouse with these grades as you exceed the requirements. Minimum is usually 7s and above so your predicted are great. My friends generally got 7s,8s, 9s and a few 6s. Sciences/maths are the most competitive so higher the grades the better.
Hope this helps! Happy to answer anything else.