As you might know from my posts, I'm fond of a drink and have been boozing pretty heavily for five years since entering university.
I left high school with 5 As at A level and graduated in the top 15% of my class at Cambridge. I then took the GRE exam two years ago, in which I scored in the 92nd percentile of graduate students for quant reasoning and the 98th for verbal. Though this isn't directly translatable to IQ, the rough estimate is that my GRE scores gave me a standardized IQ of about 138, enough to join MENSA.
Just now I took some aptitude and reasoning practice tests to get acquainted with what's going to be used in the job application process, at least for posts in the civil service and management type occupations. I passed the verbal ones, but was completely flummoxed on the quant. I had a look back over the questions and they were really easy, but with the clock ticking I just couldn't focus and couldn't get that level of understanding straight off like I used to be able to do with graphs and charts.
I've not had much sleep and am high on caffeine at the moment, so maybe that played a part in my edginess and poor performance, but I can't help feeling I've damaged my intelligence through heavy drinking these past years. Can this really happen in such a short space of time (considering the GREs were only in 2006), and is there anything I can do, such as brain exercises, to get back in my stride?