How many discs have you received ? What is the version number of main CDs ?
Typically upgrade from 3.0 to 3.5.5 looks like patch installation and number of CDs I have for this purpose - 5.
Any way, typical upgrade procedure is described in NTP NN10271-450 (4-server Sun Fire V100 Upgrade Guide). As it says:
"There are a total of 9 CDs available for the upgrade, including
• 6 CDs for Oracle 9.2.0.4 (Oracle CDs 1-6; these are the same as for
a fresh installation)
• 1 CD for the Solaris upgrade
• 1 CD for the System Management Console (This is the same as for
a fresh installation)
• 1 CD for the MCS 3.5 application software (This is the same as for
a fresh installation)
..."
So if you have 5 CDs - its just patches, if you have 9 or more CDs - its full upgrade complect. But if you have about 20 CDs - it could be an initial installation complect.