There are a lot of details about grading in my book, Setting the Records Straight.
In it, you can see for yourself how a real homeschooler provided course grades without tests!
I used tests for math, science, and foreign language because I used curricula that provided tests for those subjects, not because those subjects require tests. Most of the other classes listed in "Setting the Records Straight" describe how I evaluated without testing. If you are having trouble getting your head around this issue, the book can be a real eye-opener!
I have two articles on grading that may help you begin to think outside the box:
How to Assign Grades without Grading
Grouch Free Guide to Grading
If you haven't tested prior to high school, there is no reason to change. If there is a subject you are studying, and you don't want to test but you don't know what else to do, I encourage you to think outside the box.
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