If you have successfully completed the LINC course since November 1st, 2012, you should have certificate. A copy of this certificate will be OK. Note that completion of LINC before 2008 does not qualify for proof of language ability.
As long as you have the certificate whether you studied coursed from home or in a school is not a issue. Also when you fill up application, click YES to authorize CIC to access to your LINC score..