Is it permissible to inform friends about questions from the "Aptitude Test" after pledging not to disclose them, with the intention of spreading knowledge and benefit, knowing that failure to abide by the pledge prevents university admission?

You must adhere to your commitment not to disclose exam questions, for Allah (the Exalted) says: "And fulfill the covenant; indeed, the covenant will be questioned about," and "And fulfill the covenant of Allah when you have made it, and do not break oaths after their confirmation." Informing your friends about exam questions is considered forbidden cheating and treachery, for the Prophet (peace be upon him) said: "Whoever cheats is not one of us," and Allah (the Exalted) says: "O you who have believed, do not betray Allah and the Messenger or betray your trusts while you know [the consequence]."