Are you on about AQA B? If so, module 4 is 90/300 marks = 30% of this years marks, 15% of the complete thing. Module 8 is 120/300 = 40% of this years marks, 20% of the complete thing.
I think synoptic is 84 Ums marks and module 8/applied module is 36 marks
Yes, module 8 is broken down into two parts, one section is short answer questions on whatever that module is (I do mod 7, which is microbes and disease) The other half is the practical questions and the synoptic essay. From what I can tell on the website, these two halves are worth the same,
In the revision guide i've got it says the 2 1/4 hour exam is woth 20% of total alevel mark (120ums) including 14% synoptic, which works out as 84 ums marks.