Samsung sm-g7102 How repartition

I think it is unreasonable partition, data partition is not enough
Now there are more than 1GB of system partition the remaining space, I think points to the data partition 800MB, 190MB and now there are cache partition the remaining space, I think points to the data partition 150MB, and now my data partition space remaining less than 500MB How to re- Partition, I extracted the PIT partition files, how changes?