What's the best way to ensure your make-up stays on for longer?

I put on moisturizer then foundation but it doesn't last till the end of school..it barley lasts till lunch. Has anyone got any advice on this? I've heard Gosh Primer is good for keeping foundation on and it's better for your skin.

First you have to make sure you clean and exfoliate your skin properly in the morning. (the exfoliator has to be gentle and custom fit to your skin type and needs). Then make sure you use the right moisturizer for your skintype. If you are oily skin you have to use a moisturizer oil free otherwise this could be one of the reasons why your foundation doesn't stay on all day. Use just one layer of foundation which again it has to be custom fit for your skin type. Usually if your skin has too many dead cells at the surface and the textures of moisturizer and foundation aren't right for your skintype your makeup won't stay on. It might be as well the quality of foundation you are using. A primer helps but it is not absolutely necessary. I have very oily skin and I have to wear makeup every day at work. I use 3step system from Clinique every day morning and night. I use Superbalanced foundation from Clinique as well. My makeup stays all day and I do no touch ups.