Outdoor classification badges
It's fairly simple to get an Archery Classification, all you need to do is score your arrows on a recognised ArcheryGB round. There are many rounds to choose from, starting from 30m up to 100yards (depending on your age and category), so there's always going to be one to suit your ability. The more you score the higher your classification goes. It's as simple as that.
If you want to know what you need to score to get one, just ask the records officer.
indoor classification badges
Indoor classifications work very similar to the outdoor classification scheme - All you do is shoot and score a few recognised Archery GB rounds (Portsmouth, WA18m or Bray) - Then you get a badge
More Indoor Classification badges are available from the Welsh Archery Association and are free of charge for WAA affiliated members. You claim them in much the same way as the normal indoor badges - Just shoot and score. There are many levels so any level of expertise should be able to get one no problem.
They come in 6 colours - white / black / blue / red / gold and purple. Each one needing a progressively higher score to achieve.