Without an ATP you’d need to do an approved course, take their progress tests and be recommended by them, regardless of how you study. You only get 6 sittings to take the exams, each sitting being a four day block, so three at a time is a good idea. Start with the hardest in case you have to retake any. You can attempt each exam up to four times. I came up with my strategy after timing-out and realizing that if I waited to be ‘ready’ I’d be waiting for ever, and a 75% average was better than no average. So I studied like a bast**d for a week on each subject and went for it. I figured if I fluke half of them there would be half as much studying to do. As it turned out, I got a 95% average.