u have been asked questions before landing ? why u came early ? are u having enough money to live here ?? more over they think u came here early to do work illegally . so its better u go just 25-30 days before ur course starts .
yes u can say but it depends on officers they allow or not . i think 80 days ahead they will not allow . mainly students go 1 month ahead of their commencement of course . If u say u you are living with relatives their , they may ask u will they able to keep u in their home with their income? etc hundreds of questions come in their mind so its better if u go 30 days ahead