So, there is a school offering some courses I would like to attend in the US. This courses are non-accredited, the school is neither a university nor a college, each course is 3 hours per week and they last 10 weeks (less than 90 days).
Now, I know that I can use the Visa Waiver Program and take those courses with a visitor visa. However, I would like to take a few terms there. The gap between each term is 1-2 months, so after each term I'll leave the US and re-enter in a month or so. Would that be a problem if I did it for 1 to 1.5 years? Is there any chance the officers would reject me at the border the second or third time I try to enter?