Comments are written, but these are not aimed at the candidate and differ to the marking done by teacher. Teachers' marking aims to show pupils how to improve. Examiners marking just aims to show where the candidate has met certain criteria from the markscheme,so to justify the mark given. Any comments will usually be phrases lifted directly from the markscheme. Often a code is used, which is recognised by examiners, such as An, for analysis, Ev for evaluation. Your teacher can explain these.
Exam scripts are not marked with the main purpose being to inform students. They do have to be transparent though, because schools or pupils can request them back, but it is likely you would need your teachers in put to fully appreciate what is being said and particularly what is missing and needs improvement, as this is what is NOT commented on...examiners have to mark positively, meaning they comment on what IS there, not what is missing.
Anyone getting a script back, needs to copy it themselves, give the copy to the teacher to look at I. Advance and then arrange to talk it through with the teacher. Unless they do this, it is not very useful.
And incidentally, I would never allow pupils to put in for a resit unless they have got their script back and talked it through with me.....what is the point in resisting if you do t know where you went wrong before?