The review, which is a standard procedure for all IB World schools, looked at every aspect of how the IB Diploma Programme is run at GIS. This included looking at the curriculum, the school's educational beliefs, its leadership, resources and the teaching and learning that takes place.
The 30,000-word document, written by GIS, was sent off earlier this year and the IBO has now released its findings.
They found that: 'Based on the findings included in the report, the IB has not identified any matters to be addressed.'
The report also commended GIS in several areas, including how the school promotes Thai language by offering Thai A and also how the IB's learner profile is reflected in several subjects.
IB Co-ordinator Mr Mark Beales said: "It's fantastic news to have such a positive report. This confirms everything that we already believed about GIS - that it offers superb value education and the highest academic levels."
News of the review comes after this year's examination results, where for the second-year running GIS students had a 100 per cent pass rate in the IB Diploma.
The IB Diploma is the world's leading qualification for 16-18 year olds. It is a challenging course that opens doors to the world's leading universities.
GIS is the most experienced IB Diploma school in this part of Thailand.