hey @Kunal Gaurav​ , Yes I have given this exam and API knowledge is very very important along with Architecture knowledge of databricks

You can get all API detail;s from here- https://spark.apache.org/docs/3.0.0-preview2/api/python/pyspark.sql.html#pyspark.sql.SparkSession

this is open book exam, all the best

Thanks

Aviral Bhardwaj