Change it early, or you'll be in trouble later! If there is little change, for example, just one word. You can change it directly. However, it should be noted that the writing depth should be consistent and the font should be consistent. If you want to modify a lot, you have to redo it early. Even if you only modify one page, you should redo it all, otherwise it will be easy to be seen. It's safer to do it again from the beginning. The whole book is refilled with the same paper and the same font. However, if you want to print this form on old paper, you have to find an expert online. An old yellow newspaper has just visited Shenzhen or Beijing. You can have a try and see your luck.