Better Way to Grow your CPF Monies

Just giving some suggestions and ideas with regard to your CPF monies instead of leaving them there earning 2.5-4% interest rates. I'm not exactly sure of the CPF interest rates, they keep changing until I get confused, but anyway, from what I understand, you get 2.5% (or the major local banks from Feb to Apr of that year, whichever is higher) interest rate on money in your Ordinary Account (OA) and 4% on money in your Special Account (SA), Medisave Account and Retirement Account. There is an additional 1% on the first $60,000 of our savings, $20,000 of which can come from OA.