We live in Robina - our kids are currently at primary school, but I've only heard good things about Robina High and Varsity Lakes high schools.
Robina is an excellent suburb to live - you are connected to the M1 motorway to Brisbane and the main train line upto Brisbane.
The public transport is good here unlike many areas of the Gold Coast. Regular buses into Surfers, Southport and Burleigh Heads. It has the biggest shopping centre in the entire Gold Coast and the rugby stadium (Skilled Park) is also here. Really easy to drive around and a great place to live - you've pretty much got everything on your doorstep. Nobby's Beach, Mermaid, Miami Beaches and Burleigh Heads are about 10 mins away and it's about 15 mins into Surfers and 20 mins to Southport.