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It increases student familiarity with the material by requiring that the text and / or lecture notes be used to create identification challenges which are the main means of gaining points . It increases blood pressure because it constricts the flow of blood into the veins and the heart has to work harder to get the blood through . It increases knowledge and skills . Used in the United States as a gasoline octane enhancer and oxygenate , it increases octane 2.5 to 3.0 numbers at 10 % concentration . " Senior systems analyst Pyal Rai adds : " It makes you feel financially comfortable , it increases self-confidence .