I'll be completing my f4 by September 1st week .I'm confused on which 'skills' exam to give first in December.I'm a student and an intern .
it depends on you, ill suggest you to give f5&6 first then you can give f8&9 and lastly f7. F7 will help you alot in p2 so you should take p2 immediately after f7. F5 is not easy students find it difficult. On the other hand f6 is easy but lengthy so you have to spend time on that, f8 is easy but bit technical you need to have good understanding of that f9 is also same. This article might help you on how to prepare for acca exams, good luck.
F6 for sure, tax is very straightforward
Simple answer to your question is f5