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Hey friend to score 100 marks in maths you really have to study hard and complete all the NCERT book examples and unsolved questions.. Plus try to solve U-Like sample papers...as CBSE paper comes from NCERT book and previous year papers and this book contains all the questions which had appeared in CBSE exams.. So to score 100 marks just stick to NCERT and U-Like sample papers.... Don't left a single question untouched in these 2 books(don't be over-confident try to solve even those questions which you know how to solve them) This will eventually increase your speed and accuracy in solving questions. Just practice hard and try to take up challenge of solving a complete mock paper within 2 or 2:30 hours. Trust me this is the best method to score 100 marks.. Well i didn't make to 100 but i scored 95 marks(and i know where and on which questions i lose those precious 5 marks--that was a silly mistake though)... And Best of Luck... I'm sure you will score 100 marks coz only those people ask this type of question who has capability to do this task.........