While you save up money....you can always start reading up on everything......borrow or buy some books on aviation ... i.e. FAA published books (Flying Handbook, Aviation Weather, Aeronautical Knowledge) FAR/AIM, and...... Stick and Rudder, Aerodynamics for Naval Aviators, Takeoffs and Landings....Gliem written test prep...
You may not get everything right off the bat from reading but what you do pick up will make it easier once you start flying... and then things will start to make sense and you will be ready to take the written.