my subscription is valid till?

Jan 10th, 2019. You can enroll for CAT 2019 here: https://cracku.in/cat/pricing/complete-cracku-2019

can't we buy mocks Separately for CAT,do we need to buy Classroom program?

Enroll for CAT 2019 mocks here: https://cracku.in/pay/4ZAvE

How much percentile will be at 153 marks in cmat

CAT 2018 Percentile predictor: https://cracku.in/percentile-predictor

As of now, it is not available in the Android App. We will update the app within two weeks, then you can access the cat 2019 contents.