Application of biology can be done from "OCR Biology's" new edition.For Physics ki application consult International As and A-Level becoz most of the mark scheme points are from this book. For Chemistry, application support booklet is the best. And for other subjects do not forget to consult support booklets !
This is the complete booklet. Some of the above are just gene technology parts of the book from p13 - 29 or something. i dont know if I'm wrong but I found this one online so uploaded this too.
i hope it helps