All the exercises my son did in the first three days had at least one mistake in the solutions.... maybe more, he certainly didn't get them all. Apologies are pointless, what was advertised was stable help and that's what I paid for. Instead we lost a lot of time to check and report errors and confusion. I will pick something else to practice. Despite the obvious inadequacy of the service after only 3 days of subscription, no refund was offered. In a few years, when all errors will be recorded, the material will certainly be top. Currently not recommended
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Translation
Good luck further for your school child and for now a nice summer time.