Busybee

I am applying as Skilled Worker. In the Buffalo checklist, it says for
work experience "notarized employment contracts from your presend and
past employers; Original and up-to-date letters of reference from your
past and current employers." Does this mean I have to submit both the
employment contracts and reference letter? What should I do if my
employment contracts for former employers already lost? Is it ok for
me to just provide the reference letter from my former company?


In the buffalo checklist, it also says for education "Post-secondary
education documents". How about if I don't have any dertificates for
my high school? Do I have to provide high school degree certificate?