Thanks KRae and Dek! Thanks also for the suggestions. I'll remember this for the future. My sim did satisfy the challenge by tutoring her son who had just become a teen. Igazor on nraas forum helped me by saying that this challenge was grade related. She's about 3/4 of the way to finishing the skill tutoring now. All I have left after this is the celestial explorer and then she's done. For me in hind sight, the grand master wasn't all that difficult, but tedious. Especially having to play one opponent each night on her work days. I stacked up opponents one after the other on her days off, lol. If she was defeated, I would do an immediate re-challenge if I could, time permitted. She maxed her medical career now, but I'll probably keep her working for the income. One of the ltr's I got was the "no bills ever" one. They have a large house and many expensive items (thanks to Jon's income at the beginning) and the bills were pretty much taking up most of their income. Also of course, the extra bldg for the portraits and then I built another "house" on the same lot to move mom and dad into and eventually, all of the immortals once their kid takes over. I had Molly tutor her younger, non immortal son in cooking so he can take over the cooking. Molly is at lev 7 or 8 now and can't go any higher. Now she's finishing off w/logic and she'll be done soon. I had the younger son collect several seeds among which are 9 special seeds. Among those, I can tell that 2 of those are death flower seeds. Those seeds look red at night instead of tan. The younger son will be doing the gardening also. The older son who is the immortal for his generation, is doing fishing and is at lev 9 now.
I have a question though, does the immortal sim have to be elder before he/she can eat ambrosia if all of the super max/black ops/6 best friends are satisfied?