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It’s a tough situation you’re in – I hope you feel better mentally soon.
Speaking honestly, if you’re scoring 50% on your mocks it’ll be challenging to pass, but I suggest that you give it a shot anyway. That way you have some experience in sitting for the real exam, and would be better prepared if you choose to continue this.
There isn’t a way to estimate the monetary value of your efforts, but any effort to upgrade yourself is always beneficial.
Hope you feel better soon.