Adderall for studying (dosage help)

[Adderall123321]

So i am going to buy 6 25 mg dexidrine spansules extended realease from this guy for 50 dollars. Is this a good deal? anyways i have 2 more weeks until finals so is 6 25 mg gonna last for me? how long will it last if i split the 25 mg doses into 3 doses of 8mg? I am 111 pounds and 5.8 in height just (give me estimates. ) And when i split it into 8mg should i crush the tiny balss in them or just eat them normally? Keep in mind i have never used amphetamines so 8 mg is high dosage for begginers and i dont have adhd

 

[Adderall123321]

1 more thing to add should i take it on the exam day? i mostly wanna take it in english final because im so bad in English class would it possibly help me?