To succeed in these tests it is absolutely necessary for you to aim at speed and accuracy.
(A) for you to aim at speed and accuracy. -> CORRECT -> aim at is used with verbs -> aim at getting higher scores.here in this context aim at speed (implies aim at improving speed)
(B) for you to aim for speed and accuracy. -> incorrect since aim for is followed by a proper noun.for eg : aim for GMAT ,aim for AIIMS.Here aim for higher speed would have been correct but not aim for speed
(C) for you to go for speed and accuracy. -> eliminate unidiomatic to go is actually awkward
(D) that you aim speed and accuracy. -> eliminate since necessary for is correct usage
(E) that you should aim for speed and accuracy.-> eliminate since necessary for is correct usage
IMO (A) kindly post in the OE and OA
Its Now Or Never