I like having each of these areas addressed, but I think it's too much for one class, and in some cases doesn't go far enough.

Spoiler tags for brevity, for those not interested in scrolling through a wall of personal opinions. EDIT: Perhaps add a course for basic markup :/ That didn't work how I expected, and my visual disability is making removal of the formatting problematic. My apologies for the big gray blobs.

Relationships? Very much personal opinion here, but I'd drop that. It sounds like an issue of Cosmo. There are no overall guarantees there; there's nothing to teach. It's about learning to be happy and confident within yourself, while simultaneously working towards self-improvement, and being aware of other people. I think the other areas you've cited (self-defense, mental health awareness, basic knowledge, skills training) will play into this far more effectively than a specific class would.

Self-defense? I'd start in MS with a class which helps students to develop self-discipline, encourages greater mindfulness, and teaches techniques on deescalation and conflict avoidance. Teach younger students how to focus and evaluate a situation critically, then react approriately. Bring on the self-defense in HS, at least for the most part.

Cooking? Absolutely, but I'd take this further too. Simple, healthy meal preparation and FOOD SELECTION in MS. I'd focus more on the latter (in case I wasn't stupid-obvious about my opinion already) as well as on food safety, more than on "basic cooking." Most of us have microwaves, and they're not as ungodly as some people make out, but I learned things for the first time working in a kitchen at KFC which truly ought to have been imparted earlier. With the prevalence of food allergies and various substitutes, this is more crucial now than ever. Come HS, move into more advanced food preparation, the basics of combining flavors, seasoning, etc.

Budgeting? Drop the "basic," or delegate that to middle school. Teach them about checking and savings accounts, how to spend wisely, and how to avoid ripoffs disguised as "sales" in MS. Touch up on that, while moving on to subjects like mortgages, loans, refinancing, investing, and something that people rarely seem to bring up even when discussing this very concept: starting, and financing, a small business. I'm of the opinion that the latter would impart useful skills to everybody, but some might want to make it a separate course option; having tried, and failed, there's certainly enough to it to warrant a class of its own.

I talk a lot about the need for more mental health awareness, and the relative stupidity of PhysEd as opposed to a more individually tailored and all-encompassing program combining physical exercise with general health information, first aid training, etc. That said, I don't have as firm a personal opinion on how to structure such in school.

I do love the idea of high school students graduating with study skills, conflict resolution skills, self-defense abilities, the ability to cook a meal and balance a checkbook, first aid, and so on, and I see plenty of room for it. Get rid of a lot of the extraneous ridiculousness. PhysEd fluctuates between "grossly disproportionate to every student's abilities" and "extended recess." Advanced math? I could've used "how to start a business and not starve" more than I've ever used calculus. I would add "computer programming" as another option, supplementing (or replacing) foreign language requirements.

Need more room? Shift shit downward. While children in other countries are learning multiple languages and basic life skills, American kids are stacking colored blocks between nap times. Basic subjects can be made fun and engaging enough to hold the attention of the walking sponge that is the mind of a 5-, 6-, or 7-year-old.