I homeschooled for a lot of years and my first blog was a homeschooling blog. I was involved with The TAG Project as part of supporting my homeschooling and I really hate this idea.
"Teaching to the test" is terrible teaching. Multi-guess answers aren't good ways to test student knowledge. They are just convenient for a teacher who needs to grade 25+ students.
Please don't run around thinking of yet more ways to making it nominally more convenient and easy for individual teachers to process tests or homework or whatever from large numbers of students. This is not a way to enhance the transfer of knowledge to the future generation and is also not a good credentialing method.
There are cool things being done with tech in the education space. There are people going online and learning things they want to learn because there are rich materials available for free. But they don't look anything like "pre-grading of homework" for teachers.