And to pass Agni Pariksha test, one needed skills. So what did Ram do?Ram arranged practical lessons for Sita to teach her skills to pass the dreadful Agni Pariksha test. This was done in complete secrecy. And Sita did pass the dreadful Agni Pariksha test after victory over Ravan.
We will be discussing what transpired later after disfiguring of Surpnakha killing of Khar Dushan. Ravan started thinking about his possible options, because he knew how weak militarily, Lanka was under him, so direct confrontation was ruled out. Such things are not easy to hide and military strategists were also of the same opinion.
Militarily weak Lanka under the leadership of Ravan was not in a position to directly confront Ram. Some strategists were of the opinion that perhaps he might thing of kidnapping Sita.
Secodly when Ram taught Sita skills to pass Agni Pariksha, HE gave a CLEAR message to the world and humanity; if HE could not protect Sita and she is kidnapped by Ravan, no matter what happens physically to Sita, Ram will take her back. Passing agni Pariksha was important so that Dharm ALLOWS Sita to stay with Ram.