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sir this lesson is is like print in my mind...sir one more spectrum has 800 pages and you guide us about old we r in confusion that which is good to read...kindly clear this doubt sir...I already comment on many other platform on your posts like quora , YouTube and even on unacademy...kindly help here sir about read 800 page is not impossible but to retain and reproduce it is like impossible...but we need your words on we r going to confirm nd satisfy with preparation...plz sir