I was wondering this too. I have a 9.5 yr old daughter (only child) and based on my original choice of curriculum (Alpha Omega's LifePac) she is in 5th grade. Based on my second and current choice of Curriculum (Sonlight Core E) she could be called 4th OR 5th grade. In Math, she is either Horizons 5th grade or TT Math 7. I say all of that because I have no clue what grade she is in and I just found TWTM.
I have chosen to call this 4th grade to line her up on the grammar-logic-rhetoric sequence for history and science. We've done World History for 2nd grade (Core B+C) and them Amer History for 3rd & 4th (Core D & Core E). She'll be lining up perfect come fall in History.
I'm tweaking science to get in line for the logic phase. We've done 4 grades of LifePac Science (good but wasn't the most challenging choice). We've also done Apologia Astronomy, Botany and now Flying Creatures. I had planned Swimming Creatures next but realized I have at least 8 months before next year and I could get Physics in here to fit us into the end of the grammar stage correctly. I'm actually pretty excited that it'll be easy to tweak this school year.
With Math, I won't be changing. I just moved her to TT and it's a good fit for us right now.
For LA, I've started Junior Analytical Grammar. Love that product. Her grasp on LA is good but wanting to push it up a notch and do IEW starting in a few months. I still need to watch those TWSS videos.
What's left? Oh yeah. I bought The BigBook of LivelyLatin and my husband and I are actually looking forward to learning this ourselves. I will have her do Latin for about 6 months then start her on Spanish, French or Italian. I'll let her choose. Dad will be taking Spanish. He missed a lot in highschool.
Long post, so apologize. Just that sometimes I enjoy reading how others are accomplishing thier homeschool journey. I thought I'd throw mine in. Maybe you can pick one of two of the subjects and get them where you want them then do another set next year.
Have a great day! Michelle