I don't have the option of updating iOS 13 in my iPad . I need a help for updating it.
My iPad has only iOS 9.3.5 I need to update to iOS 13
Probably because your iPad is too old model. In that case, no way to upgrade to iOS 13.
...wrong forums.
User-centric queries/comments such as this are perhaps best put to AppleCare's public community support forums, Apple's twitter support account and/or Apple’s YouTube Support Channel vs. risking off-topic here in DevForums, thanks and good luck.