Rule of thumb for skill points is 1 per 4 intelligence. Only at the first few levels this doesn't seem to work, and you mostly get only 1.
Restoring after level up is not needed for hp, but for getting more than one attribute point it's useful: you mostly get only 1, but sometimes 2 or even 3. I think that this is truly random, so retrying helps.
If you use those extra attribute points on fortitude, you might even get more hp next time.
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