In each level you are allowed a limited number of training sessions using the library and training pod. If you put both the training pod and library in your base, use the training pod 1st. Then after you are done using the training pod, go to the library. It will ask you if you want to continue your training as if you have not finish the training session you just did. Do so and it will not count against your number of training sessions raising your ability by two for the price of one.