read and write

$ cd /home/saiganesh

saiganesh@LAPTOP-EJBON1NM ~
$ ls -ltr
total 1
-rw-r--r-- 1 saiganesh None 5 Jan 14 21:54 test.file
-rw-r--r-- 1 saiganesh None 0 Jan 14 21:54 test2.file

saiganesh@LAPTOP-EJBON1NM ~
$ chmod 0=w test.file
chmod: invalid mode: ‘0=w’
Try 'chmod --help' for more information.

saiganesh@LAPTOP-EJBON1NM ~
$ [b]chmod o=w test.file[/b]

saiganesh@LAPTOP-EJBON1NM ~
$ ls -l
total 1
-rw-r--[b]-w- 1 saiganesh None 5 Jan 14 21:54 test.file[/b]
-rw-r--r-- 1 saiganesh None 0 Jan 14 21:54 test2.file

saiganesh@LAPTOP-EJBON1NM ~
$

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as aboe i got write on others. But how to get both read and write to others on test,file

please advise