What state are you in? And what type of school are you attending (junior high, high school, college)? People giving recommendations might want to confirm that they are making recommendations that are legal for your state and your school. I'm not saying that you don't know what is or is not permitted for you to carry, just that other members here might want to confirm such information for themselves.
Here in California, it is illegal to carry ANY locking folder on school grounds k-12. It is however legal to carry a slipjoint with a blade no longer than 2.5" on school grounds k-12.
As far as college campuses are concerned, here in California it is legal to carry any size of folder, locking or not.
Such information can be found in statute 626.10 of the California penal code.
Of course, any school can impose their own rules that may be stricter than the law. And although you cannot be arrested for violating school rules, you can be expelled.
On a different note- If you are going to be carrying a knife on school grounds, and if other people at school (like maybe staff and/or security) are not aware that you are allowed to carry a knife, you might want to reconsider using a pocket clip. Why advertise the fact that you are carrying a knife and possibly invite trouble. Although you might be allowed to carry a knife, you might miss a class or two sitting in an office or security shack trying to explain that it's allowed and waiting for someone to check. Carrying "deep pocket" or in a backpack seems like it would be a lot less likely to cause you problems.