You've gotten yourself a bit confused there.
You will only ever "graduate" with around 200-250 hours. The idea then is that you get a job, build multi-crew experience and then pass a final skills test to get your ATPL after you have at least 1500 hours.
Unfortunately, the way the industry has gone exploits this fact, and people are offered some pretty shocking terms and conditions to get to their magic 1500 hours.