μ_studying = Quantity of resistance occuring during any attempt to study.
Δ_exam = The time until the next exam.

μ_studying ∝ f(Δ_exam), f(t)→∞ for t≥48 hours.

The behaviour of f is still being studied for 0≤texam11(Δ_exam1), then the values for f₂(Δ_exam2) are increased by some constant.