Input & output resistance in voltage amplifier design
The input impedance is frequency dependent because of C4 in your circuit. Add an additional stage on the input without a capacitor in its emitter circuit. 

R10 &amp; R11 in your circuit have a bearing on the output impedance and they are too high in value. Reduce these values but this will reduce the gain as it will reduce the input impedance of the last stage. Find some replacement gain from the added extra input stage.
R12 is not needed in your circuit.

The circuit below may not be perfect (say on output impedance, I don’t want to do your homework for you) but it’ll give you a good idea of what’s required as a progression. Try adjusting the values of various components and see how it affects the simulations to improve learning. 





Set-up procedure would be (in order):

1) Set the I/P impedance by adjusting R5.

2) Set the O/P impedance by adjusting R9 &amp; R10.

3) Set the Gain by adjusting R15 &amp; R16.

4) Finally set the cut off frequencies by adjusting relevant capacitors.

This would be worth doing from a learning point of view and would give you an alternative design.