Yes it is an IQ test. It stands for the developer-the Wechsler Adult Intelligence Scale.-4th edition. Full scale means the combined scores on all the subtests The exact middle is 100 which means 50% get above 100 and 50% get below. Generally scores between 90-110 are considered normal. The scores are essentially predictive of ability to do college work. There has been a lot of work to eliminate cultural bias, but in my opinion and that of others it has not been totally successful. Often times people with lower IQ scores are successful and in that case one disregards XXXXX XXXXX 25th percentile means that 75% score higher and 24% score lower. Remember it is a predictor, it is not a determiner. I have have seen people with lower scores do well in live and those with higher scores do poorly. Is there anything else you need to know?
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The wais test which is what you requested info on is generally considered to be constant between the ages of 20 and 70. I am sorry you were dissatisfied with the original answer. Best wishes and good luck..