Small traffic is not automatically a problem at 39 DA, but it removes the argument for a premium price, and it is why we push buyers towards the budget end for sites in this band.
Anything that reads like a course advertisement gets cut. Write the advice first, and let the institution's name appear once in context. Where the host is affiliated with a college or university, expect the editor to ask whether the contribution has an academic or professional author; a named lecturer with one line of credentials passes what a content writer cannot.
Within the Education section of the index — 30 listings, 54 median DA, 3.1k median traffic, $40 median price — this placement is 38% below the median on cost and roughly 37% of the index median on audience. Listings in that section range from $20 at the cheap end, so the question is not whether $25 is high for a link, but whether it is high for this one.
Also expect strict link limits, usually one, and frequent nofollow rules on institutional sites. A 39 DA educational page with 2k monthly visits is worth having in your profile for plausibility and citation, and you should not expect it to shift a competitive keyword on its own.
Our observation on this host is do-follow outbound links in editorial content. That is the attribute, not the value: the 39 DA and 2k monthly visits are what the attribute is attached to.