Hello Chian Song Lim,
Yes, It is possible through our GetTopNRankings API, this will give you the top N scores and it is possible that one user can fall in the list multiple times.
But GetTopNRankers will give you the top N Rankers(unique users). For example: If there are three users who have played the game and have scored as follows:
1. ABC 1000
2. EFG 999
3. EFG 998
4. BCD 997
4. EFG 222
100. EFG 20
Now, GetTopNRankings with N = 3 will give you ABC 1000, EFG 999, EFG 998, whereas GetTopNRankers for N=3 will give you ABC 1000, EFG 999,and BCD 997
Please let us know if you have any further queries, we will be happy to help you.