Expensive, and unless 100% guarantee, don't. If you have anywhere 3.2-3.4 and want to boost your GPA, do a postbac. 3.0 or sub = masters. This may be true to many SMPs or programs that you take with med/dental students, but it's no joke to do well. At least when I graduated from Tufts in 2018, to get a solid A, you needed to get a 96/100 on tests. So think about that...