No. You cannot exchange tests or interchange tests in any Option that you have picked upfront. In this case, 3 TFTs are given in Option 1 and 3 RFTs are allowed in the same Option. If you have exhausted 3 TFTs, you cannot exchange RFT for TFT.
However, you can always do additional TFT tests or any other tests offered by Medall and avail 10% off by using Medall HMP card.