I want to share my experience with M. Champaca seeds.I have ordered some seeds from India over a year ago. Last year, I tried to germinate over potting soil without success. This Year I tried to give the seeds a little help. I used a very sharp knife to remove the hard shells from the seeds, then I have them soaked in very hot water for 30 minutes. This will help to drive out the air in the seeds, so water could get inside. Next I put the seeds in a piece of wet paper towels. Then in a plastic bag and put them over a small florescent light over my aquarium. In 2 days, they germinate.Try this and see it works for you or not.
Q