Do you think that using such services can help students in their studies? I understand that the time-management policy says "save time on the unnecessary", but by providing such services you have to realise that not all students will separate the necessary to do it manually.

I think it's better to find a coach or tutor, and spend a few hours on an online video chat with him or her to give you a good explanation, for some of them, I recommend reading the reviews here https://callmechat.com/ and then be a professional on the subject.