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If nothing else, taking the exam will provide you with a barometer of where you were in terms of knowledge of the material and relative to your peers who took the exam. If you fail and end up in a higher Band than you thought you’d get, maybe you’re not too far off and you can try again next year (or in December) and have a better shot at passing. Conversely, if you fail and end up in a lower Band, then you at least have some evidence that maybe your valuable time and energy are better used elsewhere.
Plus, you’ve already paid for the exam. Not showing up to take it means you’re abandoning all hope of seeing ANY value from that money. A failing score and results is still value add on some level.