Different plan

 hi everyone, 

hope everyone is doing good.. 

I want to know difference between premium yearly 100 GB plan and photo enhancer and erase object plan one year .. 

as soon I will be renewing my yearly subscription from 40 GB plan to 100 gb plan (I canceled my current subscription of 40 gb yearly as I need more space) 

I am using IPhone (if this info is any help) 

I have attached the screenshot.. 

also I want to know, how can I change my plan to student plan to avail different adobe plans at reduced prices for student, and I have my student ID card.