Stimulants Mundane question about adderall administration:

SWIM is prescribed adderall, but uses it minimally -- probably about 10mg per week on average. However, it's finals time, and SWIM wants to up his dosage to 20mg for an exam. Would he be best advised simply ingesting the whole 20mg (IR), ingesting half + railing half, or railing the entire 20mg? SWIM's exam is 3 hours long. Thanks to whoever has a quick suggestion.

First time i did adderall i popped 30mg IR and i worked like a pro.

i would just swallow if its for a test
the effects will be smoother and last longer
also u wont crash during the test,like if u snort it