The European Economic and Monetary Union (EMU) is the successor to the European Monetary System (EMS) , the combination of European Union member states into a cohesive economic system, most notably represented with the adoption of the euro as the national currency of participating members.
Thus, these results should not be considered as a measure of a person's intelligence. Thus, the highest IQ possible for human brain to attain is over 220. Amongst the living people with high IQ, scientist-physicist Kim Ung-Yong has a verified IQ of 210.
As for your question, from the definition (as explained above) there really is no theoretical 'upper limit'. But, in practice, IIRC the highest IQ score ever recorded (200+) was for a Korean child of about 8 or 9 years of age. Also, an IQ score of more than about 140 or so usually doesn't mean much. That is, a person with an IQ of 170 may or may not be smarter than someone with an IQ of 150 on the same test. HTH Doug.