Revalidation of registration

Hi Sir/Madam, I am a CA FINAL(OLD COURSE) student and my registration to the same is expiring on 20/12/2018, and from past 2-3 days I am trying to revalidate it on icai.org under e-services option but i am having hell of a time while revalidating the same since there we have to upload our scanned passport photo, school/college leavig certificate and signature but on that portal it is no where mentioned that what should be the max size and the format of the document to be uploaded but i have uploaded my photo and signature in jpeg format and as regard the school/college leaving certificate i have only class 10 mark sheet which i scanned and uploaded in pdf format but after uploading the all documents it is not redirecting me to payment gateway and redirecting me to the same page where all details are to be feeded and its showing invalid file type. I am in a great great dilemma as regard to size and format of the document to be scanned and uploaded. Kindly pls pls help me.