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:
- Apache Storm
- Apache Solr
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 :)