Have social control.

Study with another person. Make a schedule, one that's realistic, and hold each other to said schedule.

If in your subconscious your own future and results won't make you study, there in my experience is no true way to force your subconscious to study for it.

It is a funny thing. I have this additional test I wanted to take, but don't need to. I imagined I'd have time to squeeze it in at some random time. The test is in two days. I am not even guaranteed to get credit for it. I was busy with other academic work the last couple of weeks. So for the second time, I am passing on this test. I did not study for it at all. I feel no pressure to do so and I am busy doing other academic work. My subconscious knows I don't need that test, so I have no incentive to practice for it. I don't feel the pressure and need to study for it, so I kept delaying starting to study for it. So I never did. Going to withdraw from it right now. My subconscious probably already did that months ago.

You saw you feel like dying, so you do feel pressure. Why can't you channel it somehow?
I mean, if you reason you should feel pressure, but there just isn't anything, not much can be done. But you have it. Use it, somehow.