Welcome to the forum! Our Rhino educational single-user licenses are perpetual; they do not expire or time out. You may use your license as long as you’d like. You may continue to use it after you have graduated or left school. The license is for your sole use; it cannot be shared with or used by anyone else. Additional details are here.
Regarding Item 2, typically yes. If you are currently enrolled and paying a tuition fee, you would be eligible. Details for acceptable forms of academic proof are here.
Please let us know if we can be of assistance. Thanks!