暑假想去加拿大看同学 顺便玩玩 但据说签证不是很好申请 请问一下有经验的同学哈～～谢谢
Check the following CIC link:
http://www.cic.gc.ca/english/visit/apply-how.asp
And also the following link for CIC London Visa Office:
http://www.canadainternational.gc.ca/united_kingdom-royaume_uni/visas/visit-visite.aspx?view=d
Basically your friend have to Provide some documentation and letter of invitation.
All the details are in those 2 links above.