The alchemist's skill will not accompany him at his latter end, and in this world, he obtains by it nothing but security against poverty and freedom from dependence on other people, But he who trusts in GD will be rewarded for his trust both in this world and the next. pg 357
Daily Halacha
One should pay full attention to the reading of Parshat Zachor so that he does not miss even a single word. But as long as he heard the basic message of the Torah portion to remember Amalek's dastardly deeds and eradicate their memory, one has fulfilled his obligation even though he did not hear every single word of the reading.