When I took the certification two years ago, it was almost the exact same as the AWS practice exam, so there should be no surprises. The questions aren't graded on the tool you use, just the validity of the end data. If you would like additional practice, then see if you can address a problem using a completely different set of tools. For example, you could write Spark or even MapReduce instead of Pig or HiveQL to solve certain issues. For others, you may find that there is only one available tool that provides the features you need.
The important thing that I would suggest is getting a good "mental map" of each of the documentation pages since you won't have access to the internet or a search engine. Know the keywords to actually "Ctrl+F" for when you are stuck, and have a good grasp on the commonly used functions/syntax of HDFS CLI, Pig, Hive, Sqoop, etc. In my opinion, the Flume documentation is very searchable because it is all on a single page, but for Hive and Pig, it takes a few clicks to get where you need.