There are many people who have got top ranks here in GATE2016 and they had a decent rank (top 1000) in GATE2015. Most of them have given their preparation strategies also. Still I would like to ask one thing- what all extra portions you did in GATE2016 compared to 2015 assuming you prepared seriously in 2015 also. This can also include any topics were you were not strong in 2015 but made strong in 2016.