Hi!
Since you have only 6 weeks, it's pointless to go for a course. Big Data stack has few very important tools that you should know about:
- MapReduce
 
- Pig
 
- Hive 
 
- Hbase
 
- Cassandra
 
- Apache Storm
 
- Apache Solr
 
- Spark
 
- Flume 
 
- Kafka
 
- Scoop
 
Start studying about each tool individually, practice a few demos to hands-on experience. Once you are done practicing every tool, comes the most important part.
Integrating all these tools and using them together to solve a big data problem. Focus a lot on this integration part.
All the best :)