"Mom wants us to study well."
Translation:Мама хочет, чтобы мы хорошо учились.
The hints are systematically wrong in this lesson. The problem is taking the "to" preposition before the verb as it was a verb in infinitive.
The - л, -да, - ли, - лся, лись, forms are frequently missing in the hints and only sometimes suggested in a second place after the infinitive wrongly formed using the "to".
I tried to report it, but this fail is generalized. In this exercise the correct option is down the list, in others it is totally missing.