Keep Pencil Eraser and Sharpener

Most of you might be thinking that you have to mark the GATE OMR sheet using a ball pen, so you dont need to keep these things. My suggestion is that fill the omr sheet using ball pen, but solve the questions only using pencil. The space given in the exam paper is not much, so you cant afford to do a long calculation again if you make some mistake. In another case, suppose if you draw a wrong diagram using ball pen, then you will have to draw it again, but with pencil, you can correct it easily. This thing had happened with me in GATE 2010, thats why I thought to mention it.