There are a lot of skills that one must have before one can be a successful student in graduate school/med/dental/law schools.
Being bright does not guarantee success.
One need be able to write, that means spell (spell check won’t work), how to write a topic sentence, how to structure a paper, how to research a topic, how to “source” a paper, etc.
This is not a skill that is taught in most yeshivas and is NOT easily self-taught.
One needs to know how to research any topic, how to judge/rate information sources, etc.
There are very few excuses that are accepted in graduate school. One needs to know how to prepare and deliver projects on time. Yontiff is not an acceptable excuse.
The “graduate world” is a goyish world,(even Touro) and one often works in assigned groups. One needs to know how to interact, relate, and work with people outside of your comfort zone. It is not an easy transition.
College, or some college will,at least, prepare you for some of the challenges you will face.
Being smart, working hard will not bring success, you will need specific SKILLS to succeed.
Often, courses given in college, ie: anatomy, are required for admission for OT, PT, PA, MD schools EVEN though you will have to repeat it on the graduate level.
I cannot imagine how large a disadvantage it would be, going into these demanding programs unprepared.