I've got tons of free stuff on-line that I use with high-school aged or adults (who tend to be slower, if better informed).
However, not much of it fits the exercises + solutions format. If I were you' I'd invest in a copy of
Mathematics for the Digital Age and Programming in Python
by Litvin & Litvin, Skylit Publishing
]
Several schools use it.
Phasing out a lot of the pre-computer math to make room for this better stuff is proving easy in some niches (impossible in others -- twas ever thus).
Kirby
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