There is answer(being question to question) within question.So upper primary school students need not do 'by-heart' to memorise answer. JUST PRACTISING TO THINK ANALYTICALLY ABOUT ANY SUBJECT PARAGRAPH WILL BE 'BY-HEART' TOWARDS IMPROVING BETTER I.Q. Students need not worry about better IQ. I.Q. will be better just by thinking analytically(why-what-how-where).