Mustbe - I will try and answer a couple of your questions. Background- I've worked as a lawyer in the UK and Far East and the UK, with it's jury system and appeal system is much, much better. Not perfect, but better than any other system I know of.
School records - the judge would have had to decide on this at an earlier hears and would have ruled on what is and is not admissable and have given reasons. I can't speculate on what they might have been, not knowing the facts.
Victim & accused held to different standards - it sounds harsh, but the victim is a giver-of-evidence, just like anyone else giving evidence. No, there are no different standards. There is no special weight given to either a victim, accused, police officer or anyone else's evidence.
Sleeping juror - sorry, no idea.
I've also been a juror, so seen it from the other side. You have to be really, really sure before finding anyone guilty. When they say "beyond all reasonable doubt" they mean it. If a juror isn't sure, then that juror will vote not guilty.
And, yes, I have always slept well at night. That doesn't mean lawyers don't question what we do and who we are acting for (in commercial law as well as criminal), but everyone who is entitled gets legal representation.