Glad you are happy with the opportunity of using the student version of AutoCAD
You can turn your 30 day trial to the full Student Version by logging in to your Education Community account and going to the My Software section; if you downloaded the program from the Education Community your serial number and product key will be displayed there. You can now re-start AutoCAD, select activate and enter the serial number and product key you got from the Education Community.
Let me know if you need any further assistance. If this completely answers your question, please hit the "Accept as Solution" button to help your fellow community members find an answer for this question quickly