I think culinary school might be more than you need. You might look into taking select classes like the [product="26789"]Culinary Institute Of America Hyde Park[/product] has to offer. In all honesty I don't even know where you would start looking for a test kitchen job. My guess is you would have to start on the bottom rung and work your way up.
You best off getting into a food science/nutrition program. Test kitchen jobs involve the research & development of new & old products. These jobs are usually held by people with a food science background. If you have culinary experience as well, it definitely gives you a leg up