I dont know who told you a perfect score of 1600 (on old test) was "very common", but it is not only uncommon but nearly impossible to get. Less than 200 students per year, out of 300K, received perfect 1600 SAT test scores. A 1600 SAT score is a guaranteed admission to ANY University in America. Bar none.
It would be like getting a perfect score on the LAST-180. You get a 180 LSAT and you will be adimitted to ANY law school in America-even if you had a 1.5 GPA.
I didn't say that a perfects score on the test was very common, I said it was common to not be accepted to schools with a perfect score. I know a female with a perfect score that went to Brown because she wasn't accepted to Harvard or Yale.
This is for grad school, but here's an example of a student in Physics:
GPA in Major: 4.00
Overall GPA: 4.00
Length of Degree: 4 Years
Position in Class: Top
Type of Student: non-handicapped middle class white American male
GRE Scores:
Q: 800
V: 770
W: 4.5 (was originally a 5.5 but I asked ETS for a rescore... my advice: don't try that)
P: 990
Perfect GPA, Perfect GPA in major, PERFECT Physics GRE score....check out some of the questions on that exam...
This fella was rejected by both MIT and Harvard.
He got into Princeton, Stanford and CalTech, but even with a perfect GPA and perfect PGRE he was rejected by two top schools.
Imagine if he had a 1.5 GPA to go with that perfect score.