ontario government plar oeshighschool.com ontario esecondary school (oes) is an online high school in ontario that offers flexible online courses. enroll in any of our ossd courses to start today. Category:education Global Rank:792,150 visits:34.4K pages/Per:5.5 oncat.ca Category:universities and colleges Global Rank:3,060,381 visits:7.7K pages/Per:3.3 ADS