I lost my class x original marksheet and I have the xerox.I was talking about Clat and Set entrance tests 

Hi Shivam,Look, you cannot upload xerox there in the application form for CLAT. All you have to do is regenerate your class 10th mark sheet by contacting your school authority and the concerned board of yours. Then upload the original mark sheet in the application form for CLAT. But in case of SET examination form, you can fill the form as I think it does not require class 10th mark sheet. It only requires a birth certificate. Good Luck!