You don't need to laminate your mark sheets and certificates to keep them safe. Because, in many cases the authorities ask to show the original marksheet and document. So in that laminated results will not be entertained. You can also keep them safe by keeping them in files away from moisture. This is the best way to keep things organized in locker at home. One thing you can do is that, take a plain white paper and keep your result within that paper means put a white paper on the result and another one under the result as sometimes, keeping marksheets in plastic files tamper its prints. Laminated mark sheets are not always accepted by authorities. Like in many interviews, companies ask for original documents. Laminating certificates and mark sheets tamper its originality. So it not recommended to laminate mark sheets.