Hi everyone!

I hope that I have come to the right place.
I need some help with the beep test.
Long story short I need to get to 10.1+ on the beep test. (To join the police force, but I would be damned if I’m only just passing!)
I keep on constantly getting to about level 8 then it feels like my legs are going to fall off.

Here is what my running routine used to be like:

Mon – 5km run in 26 minutes (keep improving on time) (5 min rest / water break) then 1.6km in 9 minutes. Both runs include fairly steep hills.
Tue – Beep test then sprints. Run as fast as I can from start of 180m line to finish, then walk back half way and sprint till about 1/4 away from start line walk and then sprint back again as I get to the line. (10x)
Wed – Same as Monday
Thur – Run as fast as I can from start of 180m line to finish, then walk back half way and sprint till about 1/4 away from start line walk and then sprint back again as I get to the line. (10x)
Fri – Same as Monday.
Sat – Same as Thursday.
Sun – Rest.

Now I’ve changed my running routine to this:

Mon – Sand dune sprinting (5x) ; Soft sand sprinting 10 reps @ 100m each ; 1km beach jog to cooldown.
Tue – 8km long run @ 10km/h pace. (10 min cooldown stretch)
Wed – Plyometric work (20 mins – includes frog jumps, side jumps, squat jumps)
Thur – 8km long run @ 10km/h pace. (10 min cooldown stretch)
Fri – Sand dune sprinting (5x) ; Soft sand sprinting 10 reps @ 100m each ; 1km beach jog to cooldown.
Sat – Tempo run 5km @ 12km/h pace (15 min cooldown stretch)
Sun – Rest day

Warm up on all days consists of:
Stretching (15 min each time)
Cycling 2km (5 min each time)

What am I doing wrong, where is the weakness that I need to improve upon to get to 10.1?
This is the only thing stopping me at the moment and it’s so frustrating and disheartening.
Help please fellow athletes!