spark-cert-3.5

Meta-skill orchestrator for preparing the Databricks Certified Associate Developer for Apache Spark 3.5 exam (Python). Coordinates the sub-skills apache-spark, spark-connect, pandas-on-spark, and spark-3.5-updates. Activates on requests like "let's study Spark", "review <topic>", "quiz on <topic>", "mock exam", "what do I still need to study", "weak spots", "progress check".