can you give some shortcuts for learning diversity chapter very quickly

diversity chapters are easy enough , 
just start with ncert , then move ahead , twice u have to read ncert as its phylum , kingdom and all of its charecteristics u need to remember . 
after that just study about the systems and the besics about classification . 
then u are all done with . 
for more info , u can refer to the askiitians study material and s.chand ref books also . 
frst complete ncert , then move with anathor book . 
ALL THE BEST ..