Only one month is left and I still have 40-50 percentile in my mocks. How do I prepare?

Hi CAT is an exam which depends a lot on strategy and planning , no matter whatever your mock scores are you can perform well if you have that confidence in you and you plan accordingly. Try to practice sectionals more , for verbal identify the mistakes in tests which are making more for example inference based or CR based etc, in LRDI try to get aware of your strengths and weaknesses and focus more on selection , in LRDI set selection is the key , in QA also try to give sectionals more try to focus more on accuracy especially in LRDI and QA , revise concepts daily and get yourself prepare for the day. Don't take mock scores at your heart , they are just a part of preparation and do not get lose hope now or get under confident. Try to have that belief in you and you will perform well . All The Best!