Each of these is a requirement to become a u. s. senator except must be at least 30 years of age, must have been a u. s. citizen for at least nine years, must have graduated from a college or university, must live in the state the senator represents.

In order to become a senator, you have to be a minimum of 30 years old, as well as have been a citizen for a minimum of nine years. Alongside this, you must also live in the state that you are representing.
Therefore, this eliminates the fact that you have to graduate from college or university, 
Hope this helps :)