Oracle database patch update doubts
You should download only the combo patch - in essence it is the two other - DB and OJVM patches bundled in one archive. After that the patching sequence is as follows:


Apply the DB PSU, but do not run any post-install steps
Apply the Java PSU
Run the Java PSU post-install steps
Run the DB PSU post-install steps


Take a look at the following support note:

Oracle Recommended Patches -- "Oracle JavaVM Component Database PSU" (OJVM PSU) Patches (Doc ID 1929745.1)

In it is more detailed information about the OJVM patches.