Science GCSE : Biology is easy for everyone, the other two can be harder..
Additional Science : Easier, because you know most of it from normal science.
English Language : Rather easy.
English Literature : Its more about knowing what the markers are looking for, and what you get marks for saying.
Maths : depends on you.
Geography : Pretty easy
RE : Easy
ICT : dead easy
Drama : REALLY FUN, REALLY GOOD. but hard because you can try to be too funny and get undermarked, and the written work is hard
Art : really hard.
PE : depends if you like it.