Chemistry and Physics ATP

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What is the best method to prepare for chemistry and physics ATP? And do questions from organic chemistry come in chemistry ATP? Please help. :)
do past papers of ATP.....u will get familiar with the pattern that is generally followed in ATP. they are most of the times same questions.....specially if you notice chemistry ATP past papers, literally there is a single pattern but every year name of reagents and quantities are changed. Yup Organic Chemistry do come but mostly in multiple choice questions of ATP. Physics ATP is kind of hard(its hard for me) but even there by doing pastpapers u will come to know abt all errors and precautions that they frequently ask.