Last year and a half i cleared ocp java 8 certification. Oca score was 97%, ocp score was 92% or some high score, i cant remember. I really worked hard and learned Java well as a beginner. Despite what the internet say, Java certification have some seriously bad reputation, i found that too late. My advice is to avoid it, not a single thing learned during certification cant help write simplest code as a beginner. By the time you learn to use some framework or to make simple game like tetris most of the things are forgotten. I hate to say it now but certification is useless for beginners, don't do that.