You can upgrade ADA from 9.3 to 10.2, then from 10.2 you can upgrade to 11.0.
You should make full database backups or server backups before starting any upgrade.
Here is the link to the 10.2 Upgrade guide which explains the upgrade path:
https://docops.ca.com/ca-application-delivery-analysis/10-2/en/upgrading/upgrade-paths
Here is the link to the 11.0 upgrade guide which explains the supported upgrade paths:
https://docops.ca.com/ca-application-delivery-analysis/11-0/en/upgrading/upgrade-paths
If you will be upgrading MTP's as well, there will be a different upgrade path for the MTP, if you need that information please let me know and I can provide it.