Found this on the National Assoc of Advisors for the Health Professions:
Predicting MCAT Examination Scores from the ACT
Beth Dawson-Saunders, Ph.D., Rosalie E.A. Paiva, Ph.D., and Deane R. Doolen, M.A.
Abstract Acceptable performance on the MCAT examination is necessary for acceptance into medical school; therefore, students planning a career in medicine and their advisors would benefit by being able to predict performance on this examination. The present study examined the validity of the ACT examination as such a predictor, using as subjects 197 undergraduate students at a large Midwestern University. The results indicated that the ACT composite score was strongly related to MCAT performance, although the predictability was enhanced by inclusion of information on the students grade point average in science subjects: multiple RS ranged from .57 to .62. Contingency table analysis indicated that 80 percent of applicants who scored 25 or higher on the ACT composite had a score of 8 or higher on the MCAT science problems subtest. Used appropriately, these results can serve to suggest whether a student needs to take remedial course work before taking the MCAT examination.
So the ACT question was probably inspired by that abstract or a similar one.
Do you have high grades in all of your premed coursework? He's probably just concerned about trying to fit both studying for the MCAT and maintaining your GPA until May, and is trying to judge if you've pulled off preparing for big standardized tests in the past.
The worst advice I've ever gotten from a premed advisor was that we should seduce adcoms and administrative people in the admissions office into admitting us with gifts (I think his words were, "You should find out if they like a certain kind of chocolate, and then make sure you send some to them"). This guy still comes and gives presentations at the NIH, and I fear for all those who attend.