As far as the NAPT goes don't worry about it.
Basically, it's mathematics, chemistry and physics. Basic physics (acceleration, gravity, forces, 3 laws of Newton, etc). Chemistry (balancing equations, knowing the difference between acid and base i.e. the pH difference, adding atomic masses of different elements together, knowing the periodic table, knowing what the little numbers mean next to an element letter, etc). Mathematics (basically knowing how to add, subtract, multiply and divide mono-, bi-, and polynomials, etc).
So basically:
1. Know the difference between an acid and a base
2. know how to balance chemical equations
3. Be familiar with multiplication and division of polynomials.
4. Understand the use of the periodic table.
5. know how to change formulas around to get to a specific variable. they will give all the formulas on the test, you just need to know how to move them around.
6. Even though they give the formula, be comfy with radioactive decay.
7. Study Hydraulics (if you have two pounds of force on an area of an inch, how much force will it have when applied to an area of three feet)
8. Brush up on newton's three laws. especially the acceleration of gravity.
It's fairly easy, just think, the questions may play with words and try to confuse you. They give you the formulas you need, you may use a calculator. With the formulas, learn how to move the variables around to get to one answer and using that answer to replace it in another formula to get the actual result. You know. so know your way around formulas. And there is some theory, like if two objects collide, one 5 g and the other 10 g, is the acceleration the same? Or something like that.
Ummm, take your time, if you don't know it move it on and go back to it if you have time. You'll have time after believe me, you'll go through the easy ones without even using a calculator and then you'll have time to look over the tough ones.
Just thought I'd put my two dimes in about the test to any one else looking to take the NAPT.
