I am scoring very less in mocks only few days are left .how can I improve and my speed is also very less

First of all read your NCERT Book thoroughly and then try to solve the mock tests . If you having some problem with the english section then Spend an hour daily exclusively for reading books or editorials to improve your vocabulary and comprehension skills. This will help you for all types of questions in verbal ability section..and If you were having problem in solving numerical questions then In quant section, start with learning the basics of each topic and then spend significant amount of time to practice...