Since this topic keeps repeating even in game, the MR 9 test does not need a specific frame or weapon. Just go to practice mod an spend 5 to 10 minutes learning the enemy movement pattern. When you do the test it's the exact same. Also take your time taking out the enemies, what I mean is there is no need for style points or rushing through it since it is not timed. Also MR is not everything in warframe, I have had this discussion in-game. You just need to reach a certain MR to access everything ingame, At that point it's your wish if you want to level up further or not. MR14 for all the normal weapons, MR15 for prime weapons (AK Lex) and MR16 for the highest mastery requirement for rivens.
I do admit DE needs to change the intervals during failing a test and retaking it. Other than that, till MR 16 every test can be cheese with a warframe and weapon you already got.