mistakes and carelessnesses are very common in the checking of answer scripts by WBUT.In PPV,you will be shown the answer scripts which you claim for in PPV and you will be given a sheet for each paper where you have to write down what are the problems in your script checking and accordingly,your answer papers will be checked by the examiners.So,in PPV,your answer scripts will be checked perfectly and your marks will be increased for sure,if you deserve it.