In the BigData world companies are looking for certified professionals because there are lot of training institutes globally, which are giving certifications that candidate have completed the training and eligible for employment of that certified technology. But when time comes to work upon that technology on a specific project then things are completely different and candidate is not able to perform and company had huge setback, this happens many of the time. 
 
So various companies had provided the feedback that they need candidates who had proved their skill-sets in the technology they are going to work upon. And because of that all below companies decided to have Hands-On certification program or exam to check the candidates proficiency in the Big Data technology. 
CRT020 Spark Scala Certification CRT020 : PySpark Databricks Certification Hortonworks HDPSCD2019 Spark Scala Certification Exam Spark Professional Training Spark SQL Hands Training  PySpark : HandsOn Professional Training PySpark Structured Streaming Read Spark SQL Fundamental and Cookbookhttps://sites.google.com/training4exam.com/spark-sql-2-x-fundamentals/ Spark Interview Questions Cloudera CCA175 Hadoop and Spark Developer Certifications
 
With the HandsOn exam learners previously using the Briandumps or steal the real exam questions and clear the exam without even knowing the single things. At least for the BigData world things are changing and most of the exam have at-least HandsOn section or assessment as part of their certification exam. And candidate has to prove himself that he had really worked upon some project or POC's for the BigData technologies and he has the enough skills to work upon the BigData projects. Below are the most popular BigData certifications exam.
 
Certifications from Databricks on Apache Spark technology.
You can use the certification preparation material from HadoopExam.com as given in above links. Even you can get the access to training and interview preparation material.