Eren wasn't inclined to attain Minerva's true inheritance through this route.
His original strategy had been to excel in all four tests with flawless scores when he was on the cusp of ascending to the Master Rank.
This calculated approach would have afforded him the best odds of securing perfection across all trials. However, his unexpected promotion to the Master Rank, sparked by the unforeseen Battle Trance encounter with the wyvern, disrupted this blueprint.
As such, Eren found himself compelled to obtain Minerva's Legacy under considerably more demanding circumstances by using a crafty yet pain-in-the-ass trick.
***