In going to Pansol from C5, you have two options:
1) Exit to Mayapa
After canlubang toll, turn right on the first exit at mayapa. turn right on Checkpoint, traverse the Parian national highway to Crossing, then turn right to Calamba national highway to Pansol.

2) Exit to Calamba (last south tollway exit)
Turn right then straight to traverse Real road. You will pass on Calamba waltermart and few blocks turn right to Calamba National Highway to Pansol.

Happy trip!