Step 1. Go To http://oneclass.com/a/577066 [you will get 60 credits free]
Step 2. Sign Up With Your Email.
Step 3. Verify Your Account And You Will Get 60 credits.
Step 4. Share Your Referral Link Amongst Friends or others etc.[ 1 referral with account verified=50 credits]
Step 5. Collect Badges, Upload Notes.
Step 6. Get 800 points and Then Redeem Your Gift Card.