No. In Jain Dharma, Raavan is not the 25th Tirthankar.

Jain tradition recognizes only 24 Tirthankars in each time cycle, and there is no 25th Tirthankar. Raavan is described in Jain literature as a powerful king of Lanka, not as a Tirthankar.

If you want, I can also explain Raavan’s role in Jain Ramayan in a simple way.