Databricks and Apache Spark are both entirely different. Databricks is a software company, whereas Apache Spark is an analytics engine for processing large datasets. The only point of relation between the two is that the creators of Apache Spark are the founders of Databricks.
If you are searching for a training course to crack Databricks Certified Spark Developer certification, then check out the Databricks Spark Certification Course from Intellipaat. Also, watch this video on Spark Tutorial for Beginners to get started.