Hello Sagorika,
You cannot get previous years original question papers and answer keys as the exam authority doesn't release the paper.
Better you refer books like RS aggarwal and subhkamna Publication for mental ability and verbal section
Arun sharma quantitative aptitutde
Try to give as mock as possible even Symbosis also conducts mocks test before exams which will be really helpful.
Hope I helped you.All the best for future endeavour!!
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