2015 sees OSC celebrate its 25th Anniversary and in April we celebrated with a birthday party. It was a great occasion where we saw friends, colleagues and partners of OSC who have been involved with the company from 1990 until present.


Since 1990 we have helped thousands of IB students to succeed in the IB Diploma Programme, and reached even more of the IB community through our high-quality products and services. Here are just a few impressive statistics that tells our 25 year story:

  • 30,000 IB students have attended an OSC course since 1990
  • 300+ IB teachers have taught for OSC since 1990
  • Students attend from an average of 450 IB schools each year
  • Students represent up to 90 nationalities each year
  • Over 70 Revision Guide titles published, online and in print
  • 1100+ IB schools visited as part of our School Visit Programme