Here are list of references I am studying
1 - Principles of Geotech Engrg - Braja Das
2 - CERM
And list of Test books I am practicing:
1 - six-minute solutions for PE civil geotech
2 - Civi PE Geotechnical by pe prepared
3 - Geotechnical depth problems by bruce wolle
4 - Practice Tests Kit for Pe Geotechnical by Ali Sheikhbahaei -
Anything else?