Getting knowledge on SAP EH&S tables is the first & most important skill which helps us in preparation of " Functional specification document" which we may have to provide Technical consultants for performing technical customizations to standard business process during implementation time.
Here i was mentioned the steps for easy accessing of EH&S Tables
1) Go to the Transaction code SE11 and select the "Input Help Personal value List" button as shown in table
2) Select the "SAP Applications"
3) List of Database tables for all will appear from that Select "EHS" and Explore it ,Under EHS all Sub Modules tables will come