Eleftherios Argyropoulos tested his intelligence level for the first time in 1988 in the matrix progressive scale, when he achieved the performance of 156 from 160.

Dr Anastasios Stalikas, the chairman of Athletic Psychology of the Ergometric Center of Athens Olympic Stadium, tested him in1993 independently from the previous test and he measured 158 on the same test, when Eleftherios underwent a special examination in order to determine his IQ level. It must be noted that Dr Stalikas measured high concentration levels even after fatigue due to one hour running.