Just remember when you do your exams that most of 16yo only like to get wasted and get into relationship.
By just reading a bloody book you already put more effort than 50% of the students, if you also managed to do 10 past papers for each gcse that 90% more effort than everyone else.
I did 15 past papers for maths got 20 marks above 9 you will be amazed how repetitive gcse questions are, so forget abaout 7's you can get 8-9 ez.
Also you are at this website which shows you do care so I am expecting you to get all 9's.