Theres not much you can say except for focus on squeezing it. Maybe the problem is tightness of your calves or hamstrings, you could work on flexibility. Otherwise just make sure you are working drills with straight legs, and make sure your legs are squeezed when you work your static split.
Back kicks, focusing on keeping the knee tight, change split jumps on the tramp or hanging on the bars. Splits with the back foot flexed or raised so the back knee needs to be squeezed rather than resting on the floor. I also find getting them to think about lifting the knee rather than the foot helps to keep the leg straight.
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