How can i get student discount?

You will need to prove your student status

Start at http://www.adobe.com/education.html
-https://www.adobe.com/offer-terms/student_teacher_eligibility.html
-Cloud Education Plan https://creative.adobe.com/plans?plan=edu
-http://www.adobe.com/creativecloud/buy/students.html
-FAQ https://helpx.adobe.com/x-productkb/policy-pricing/education-faq.html
-One Year Intro Price https://community.adobe.com/t5/account-payment-plan-discussions/why-is-my-account-now-31-a-month-and-not-the-20/td-p/8862330
-Redemption Code https://creative.adobe.com/educard
-https://helpx.adobe.com/x-productkb/global/graduation-education-discount-expiry.html

contact adobe support to change your plan. there are 2 ways to contact adobe; chat and twitter:

chat:
use a browser that allows popups and cookies
and click here, https://helpx.adobe.com/contact.html?rghtup=autoOpen
in the chat field (lower right), type AGENT
be patient, it can take quite a while to reach a human.

twitter:
tweet @AdobeCare

p.s. if you're contacted by anyone (via email or private message), it's much more likely to be a scammer than an adobe representative. ie, double check for an employee badge if contacted in the forums and look for an adobe.com domain in the email address if you click reply to an email. then check again and be very suspicious. any other method of contacting (or offering to contact you) is almost certainly a scam, https://community.adobe.com/t5/using-the-community-discussions/staying-safe-in-the-adobe-support-community/td-p/12919684/redirect_from_archived_page/true