What holds merit is decided largely by how we choose to exploit our individual abilities.
I totally agree. As long as an effort is put in, results will definity come back positive. This is assuming that you are a normal functional human being.
There is also evidence that average IQ scores worldwide are rising. This is called the Flynn effect. So with that in mind, are we getting smarter or is the test being less valid?
Well, fluid intelligence is ALWAYS important in the acquisition of knowledge.
Maybe, if you define fluid intelligence as the ease in which a person is able to learn. This definition is flawed however because then fluid intelligence would vary from person to person and from topic to topic. For example, I go to my European History class every single day and can honestly say that I have learned virtually nothing from that class. This lack of learning is not due to my deficiency in fluid intelligence, but rather as a difference in interest. Now, if you were to place me in any psychology class I will start to pay attention and learning psychology will seem a lot easier for me simply because I am more interested in it.
Also, there is evidence that as we age, our fluid intelligence may diminish but our crystallized intelligence remains relatively intact.
"There are some consistently observed changes in CNS function with "normal" aging... deterioration in "fluid" intelligence (i.e., the ability to dynamically evaluate, accommodate, and respond to novel environmental events) also occurs."
"However, some tests used to assess intelligence are influenced by motor speed, so slowed reaction time confounds the assessment. On non-timed tests, vocabulary, verbal information, and comprehension are well maintained. "Crystallized" intelligence (i.e., accumulated knowledge) is also relatively stable into the seventh decade of life"
http://www.cja-jca.org/cgi/content/full/50/suppl_1/R12