The VOSON Student subscription is an annual subscription at the Professional Tier service level. Available to active undergraduate or graduate students for just $25/year, the Student Professional subscription contains all of the features of the standard Professional Tier, including the 500 VOSON Activity Unit (VAU) monthly allowance and higher crawl priority than the Free Trial. With the Student Professional with Twitter subscription ($50/year), students can also create networks using Twitter data and enjoy an even higher VAU allowance!
You can find out more about VOSON subscriptions, including the Student subscription, from the subscription FAQ page.
Professional With Twitter