Open sylink.xml file inside the package. If you are able to see an entry as PreferredMode="1" it is in computer mode .If it is as PreferredMode="0" it is in usermode 

If you have create as a single exe then use winrar and open sylink.xml file.
you will find one line PreferredMode="0"
If its 0-->User mode
If its 1--> Computer mode
 

inside sylink CM is push
CommunicationMode="PUSH"

but in SEPM Communication settings its Pull mode, now which settings has priority.
sylink has the first prirorty or SEPM settings has the first priority ???

The moment you install it will get installed with all settings which is present in sylink file. Then it will contact SEPM and will check for the policy setting in server if any change is there it will make those changes in client. 

will it make changes in sylink file or some other file...I have seen sylink is not getting updated after pushing policy

It will make the changes in the sylink file...

.....Edit....
Compare both these sylink files.
In SEPM every group has its own sylink and Group ID
Program Files\Symantec:\Symantec Endpoint Protection Manager\data\outbox\agent\0F4C825779F74C7000A2E19EBC385AA7 --(the first 4 digit represent the group id)

symantec endpoint protection\sylink.xml --on the clent.

One more thing to do Open the SEP Clients-- Help and Support -Troubleshooting -check the policy serial number ( 4 digits)
Then check if you have a folder in the above location on sepm server starting with that number..

........
  You can check the policy serial number in client and server... If both are same then it has taken the proper settings form the server...

Policy mode and PreferredGroup are also set in the registry... 
Check this...
HKEY_LOCAL_MACHINE\SOFTWARE\Symantec\Symantec Endpoint Protection\SMC\SYLINK\SyLink

Verify the policy sl. no present in client and server is same or not. In server you can find policy sl. no in details tab of corresponding group and in client in help and support-->trouble shoot. If not same give update policy. 

both sylink are same but in communicatinon settings its pull mode & in sylink its push mode... what may be the problem.

  Is the policy serial numbers are same for client and server?

Replace the sylink file and give update policy...
Check whether the sylink file changes or not....
  Both should be same...

policy serial numbers are same...

which sylink I have to replace on client machine, installation packages sylink or the 1 which is present in this path Program Files\Symantec:\Symantec Endpoint Protection Manager\data\outbox\agent\0F4C825779F74C7000A2E19EBC385AA7

moreover on server end ...outbox\agent sylink is having push mode..where as in SEPM its pull mode..

sorry its getting changed..I have was looking into some other group & got confused...thanks for your kindly hlep...

sorry its getting changed..I  was looking into some other group & got confused...thanks for your kindly hlep...

NO problem... Man makes mistakes sometimes... ha.. ha....
Happy to here that ur problem got solved...