Time Strategy will depend on your strength and weakness. it will hinge upon your maths ability.
Sectional Cutoff is very difficult to predict than overall. I Think the cutoff depends the students and paper level marks scored. Anyway this can be generalised to be around 20 -30% of the total marks. for 50 it will 10 -15 But 20 Correct answers is considered the safest in Apti.
Now I have given SBI PO and DI was toughest. I dont know the structure of apti for SO PO if its only DI Based and no Numerical ability then you need to be careful. Reply back with any query i will try to answer