How do you plan to solve it?
module jk_ff ( input CLK, input J, input K, output reg Q ); // Write your code here always @(posedge CLK ) begin if(J==0&&K==0) Q<=Q; else if(J==0&&K==1) Q<=1'b0; else if(J==1&&K==0) Q<=1'b1; else if(J==1&&K==1) Q<=~Q; end endmodule