What is your purpose in baking the Test? Is it to remove excess BA or to sterilize? If to sterilize then run it through a .2u filter that will get any particles out and the BA will prevent any bacteria. If to remove BA, you're better off just cutting with oil. There should be no other reason to bake it.
To bake:
1. insert syringe into vial making sure its not in the oil but in air space above.
2. preheat whatever your baking in to about 130C/266F
3. bake for 15 minutes, let cool.
Ill say again that baking is not necessary for sterilization because the benzyl alcohol kills any bacteria in the oil. If your concerned about larger particles then the filter will remove them. Baking could make your steroid crash and become cloudy if enough benzyl alcohol evaporates during baking.