Hello Pravy
LOGNAME=oraTST
USER=oraTST
Is this the right username ? Bear in mind that on Unix names are case sensitive.
Check the value for SAPREORG in the initTST.sap file located at /oracle/TST/112_64/dbs
SAP Library - SAP Database Guide: Oracle (BC-DB-ORA-DBA)
If there is no reference to that then I would create a symbolic link for the time being.
ln -s /oracle/TST/sapreorg /oracle/TST/112_64/sapreorg
Regards
RB