oh, well that changes everything then.
if you're gonna take the test in april, then what i would do is study the general principles (for each section) first until you have a solid grasp on those. then go back and review, this time learning some of the details (like neurotransmitter classes, which actually might be somewhat important on the test).
my general rule of thumb is as long as you have enough time and energy, study anything that is functionally significant and useful in understanding major concepts (neurotransmitters might help you do this, but that kind of detail is 99.99% of the time NEVER going to come up on the test without a passage explaining the differences in NT types). if it's obscure facts like the conduction speed of a neuron or how much insulin is secreted by a beta cell daily (i'm sure these kinds of things are in your textbooks) then don't waste your time memorizing it.
details you should know: na/k pumps (how many ions are transported), what is the threshold for rapid depolarization, what is the maximum level of depolarization, how NTs are released, how NTs act and can be blocked (either by the immune system or drugs), etc.
bottom line, study to improve your understanding. whatever helps you learn the material better will result in a better score on test day. 👍
i hope my rambling helps, but if you need clarification i'll be happy to provide some.