The Best advice I can get is to find what math you like best and pursue it. If you don't like graphs, then stick away from cal. If you like shapes and angles then go geometry. If you like angles with trig funtions then trigonometry of course would be best.
talk to a different math teacher at your school... tell him your teacher doesnt know what the fuck shes doing and try to stay after with another teacher and have him/her go over it with the things your having the most problems with