After finally getting to Uhin, you will have to face from three to five challenges. The number of challenges depends on your humility. The humbler you are, the less challenges you will have to face.
You can use the Demon Mark during the challenges, but I don't recommend it, because you risk turning into Uhin's servant.
Here are some tips on each of the challenges:
1) Your mother - you have to either have a very good relationship with your family or a lot of pride.
2) Your friend (it can be your animal companion, the Grey Wolf or Marya Morevna, if you betrayed any of them, or your sibling, if you didn't betray anyone) - you have to be very self-reliant, be very humble (animal companion, the Grey Wolf, Marya), or have a very good relationship with your family (your sibling).
3) Your double - either be very smart or very self-reliant.
4) The tsar and the tsaritsa - you must have a great relationship with your family, or be really weak and inexperienced, or be good friends with Marya, or know the royal family's secret (
).