how many released part 1 exams?

I got some reprints of released part 1 exams. I am wondering if I got all though A-K like in original released exams. Does any body purchase original booklet from asda? How many exams are there?

If it says, July1982ec 1984 (released 1983) , what does it mean? Did they repeat same exam right after releasing exam?

Does each booklet contain only one set of exam?

Thanks!