Is it possible to drop export some shema without data and the other with data I have oracle 11G R2 under RHEL 6.3 test is the name of the database, the database contain 12 custom schema, sch1,sch2,...,sch12.  is it possible to create database backup using datapump method that contain all of the schema with no data except the first three one, the data is needed.
You can export specific schema using the SCHEMAS parameter:

http://docs.oracle.com/cd/E11882_01/server.112/e22490/dp_export.htm#i1007509

You can export the definitions of data alone using the CONTENT parameter:

http://docs.oracle.com/cd/E11882_01/server.112/e22490/dp_export.htm#SUTIL838

Combine the two:
        expdp user/pass SCHEMAS=a,b,c CONTENT=METADATA_ONLY [........]

This will achieve the aim of just doing the schema.  You'll need to do the 3 schema where you want the data as a separate job.