You can start the test by clicking 'Attempt now' button. BYJU'S Exam Prep test interfaces are kept as close to the actual exam interface as possible. Usually, the first page(s) contain(s) instructions about taking the test and the marking scheme. For submitting mock click on the left-hand top corner of the App " question number" and select "Submit Test". Please note, once the time is over, your answers are submitted automatically.