I am using testbook app since 4-5 months and I am satisfied with its services .you will get mock test and. You can also buy it at very low cost.easy appearance of testbook app which provide easy interface between user and testbook facilities and at festival time it also gives various offers for their users.you can give live test and also check your score between various testbook app users.
I suggest who are preparing for bank ssc testbook is one of the best site for preparation of worth free of cost .I donot faces any issues till now from this app and the level of questions that their mock test series have is also same and similar to the pattern of various bank ssc exams .so you will not disappointed by its mock test.
So I will suggest you to go to testbook and register yourself for your prepration .so best of luck for your preparation