spectroscopy

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You may or may not have it on your test. Some say it never showed up, others say only 1 or 2 questions involved spectroscopy. If you want to get those 1 or 2 questions correct, then yes you should memorize the values and be able to visually recognize peaks of different functional groups. Good luck studying!
 
How hugely does getting 3-4 questions wrong in this section impact the score?

how would the regret feel of not being absolutely sure you nailed those two or three spec questions (how many i got on my DAT) to get the best score you could?

it's time to man up