Its probably approximate, not exact. If a vocational training course takes a year to complete, they give you 3 years. But they want you to be more than half way done by the end of the first year. Its not 1/3, 1/3, 1,3. Its 60 pct done, then do at least another 15 pct, then slide the remaining 25 pct home. It looks like the want to motivate you for that first year but probably give you some breathing room if you come close. But dont to like 25 pct the first year and say you will make it up the following two years - they say theyre not buying that.