A new study in Acta Psychologica reveals that schooling largely explains IQ differences in identical twins raised apart. When their educations are very dissimilar, their IQ scores can be as different as those between complete strangers.
From what I remember about them, you will especially get different results if you test again within a short time span. After a year there should only be differences due to other circumstances, like stress or other stuff that influences the workings of the mind.
From what I remember about them, you will especially get different results if you test again within a short time span. After a year there should only be differences due to other circumstances, like stress or other stuff that influences the workings of the mind.