If we're talking gliding then there is only a written test(multi choice paper) for the bronze badge. There isn't one for the silver.
Its a few years since I did a bronze paper but at that time it was fairly straight forward. Basic questions on air law, met, gliding etc. Nothing too taxing.
Your local gliding club will keep you right. Its usually just a case of finding a quiet corner in the clubhouse somewhere when your ready and having a stab at it.