I had student visa refused after my 12th in 2011 because of telephone interview. The main reason was lack of knowledge about course .After that i continue my study in india and done bsc nursing with good grades and 2 year full time experience .Now i got 7 band in ielts not less than 6 I want to apply for september 2019 intake. I lost my Newzealand refusal letter what can i do now when apply for canada student visa. Should i mention the detail of previous refusal or not.