First, I don’t know that all locations are impacted by stingy education allowances. Some are. You will need to test this.
Second, shame on ExxonMobil. We should be enabling our children to pursue S.T.E.M. careers. Do you know how important consistent curriculum is to doing this? Very important! Slip one math level, and your child likely feels too far behind to try for an engineering degree in college. An European in US? Moving back to Europe, your whole future may depend on success in your country’s exam scheme. Does a U.S. public school provide you the right support? Probably not.
Yes, international school in home-country curriculum is ENORMOUSLY expensive. But people and companies pay it for exactly these reasons.
If you are asking an employee and their family to move for the company, the financial burden of a home-country education should not fall on the employee. Many lesser employers pay to enable attendance at these schools. It really is awful.