"I've got end-of-semester exams starting next week," Harold told The World Game. "I've been studying all morning.
"After this year it will be six years at uni for me and I'll have roughly another two years left.
"A straight law degree normally takes four years, but I'm obviously doing it part-time to fit in with football.
"The university I attend is pretty accommodating. I've been able to organise alternative days for exams when they clash with my football commitments, which makes my job a whole lot easier.
"That way, I haven't had to stress about it."
Harold isn't stressing about the clash with the Sky Blues at Allianz Stadium on Sunday, either.
He respects what they have done this season, scoring 13 goals and conceding just one to win all five of their games so far, but he is confident Perth coach Kenny Lowe and his staff will come up with a plan that is capable of undoing them.
"When we beat Melbourne City on the road in round three we had a game plan and executed it perfectly," Harold said.
"Sydney finally conceded a goal last weekend, so their defence isn't impregnable, and when we've played them in the past their style has tended to suit us.
"They're hard to break down, but they'll have their home crowd putting pressure on them to go on the front foot and play attacking football and we can try to exploit the gaps on the counter.
"Sydney have started this season like a house on fire, but we've got a pretty good record against them in Sydney in the last couple of years so we can look at that as a huge confidence-builder for us."
The Sky Blues won 4-0 the last time the two teams met in Sydney, but Glory won the previous two clashes at Allianz Stadium, each time 2-1.
Perth are in fourth place, but could easily be second, immediately behind Sydney, had they not given up leads in home games against Central Coast Mariners and Western Sydney Wanderers, which ended in draws.
Harold said that's what they've got to learn from.
"We've shown in parts that we can really threaten teams, but we've been a bit hot and cold overall," he said.
"We can't do that against Sydney."