Tips for Dealing with Rejection/Failure

Does anyone have tips for dealing with rejection/failure? I thought I had a job lined up but tonight I failed the 2nd part of the exam process. I didn't study enough and I probably didn't refer to the guidebook enough during the exam. When I found out I failed I first was numb and very quickly turned to bawling my eyes out. I cried myself to sleep but now I'm awake again and I feel like such a failure and a worthless human. I've been trying for several months to get a job but it seems my ADHD, autism, and astigmatism (can't drive home safely at night so can't take night shifts) all prevent me from getting anything. I felt so confident about this opportunity and now I failed that too and honestly feel I don't deserve anything as a result. Like right now I'm hungry but feel I don't even deserve breakfast in the morning because I can't even pass a stupid test to get a job so why bother with food when we're struggling financially anyways. Anyways sorry for the rant but yeah any tips for dealing with rejection/failure would be amazing. I don't want to fall into a major depressive episode as a result of the failure but I fear I already am.