How to draw the JK flip flop waveform for Q
I’m sure you know the truth tables for both the AND gate and the JKFF, or at least you can find them with a quick search.

So, just start with the AND gate: the output of the AND gate is 1 when both inputs are 1; otherwise the output is 0. 

Therefore, at the first clock cycle, the output of the AND is 0, since x is 0. So, J becomes 0 and K becomes 1. This is a reset state, which drives Q to 0 and Q_bar to 1. 

The second clock cycle doesn’t change anything since your JKFF is falling-edge triggered (note the inversion symbol on the FF’s clock). 

At the third clock cycle, you now have two 1s at the AND inputs, so your J and K becomes 1 and 0, respectively, which is a set state.

I’m sure you can work out the rest.