(The initial state of Q0, Q1 and Q2 is 0)
The counter is a three-bit "counter" which counts ____?

(Hint: consider the top JK output as LSB and the bottom JK output as MSB)

 

What have you done to answer the question? What do you think the hint means? What does that logic chip do?

Can you draw the output from the first flip-flop?

 

Assume that each flip-flop is driven by the same square-wave clock signal.
Do you know how a JK flip-flop works?

 

What is not shown is the clock signal driving the JK flip-flops.
re: https://www.allaboutcircuits.com/technical-articles/t-is-for-toggle-understanding-the-t-flip-flop/