Your actual test environment will have ambient noise (typing, coughing, clicking). If you only revise in a sound-proofed library, a mouse click will break your concentration. Play "Coffee Shop Ambience" or "Office Sounds" on YouTube during your final two weeks of revision.
Physical calculators are instant; on-screen calculators have a 0.5-second lag. That lag adds up. For simple division (e.g., 144/12), do the mental math. Practice keyboard num-pad entry. Do not use the mouse to click the calculator buttons. aptitude test revision