The marking pattern in RGPV is very unpredictable. Sometimes you score well in exams you did not attempt well and get low marks in exams you wrote well. This is because the checking depends on the mood of the examiner and your luck.
However, I don't think you can just write anything and expect good marks. Also, the common ruling that filling a lot of sheets gets you more marks is also untrue. The quality of the answers should be good enough to score good marks. The best way is to practice a lot from the previous year papers. After making the maximum efforts you can leave the rest to your luck.