Choosing a partition type

[Kamal Joshi]

I have a table of 100 millions of records. The table detail is as follows

CREATE TABLE `X` (
`memberid` int(10) unsigned NOT NULL,
`exerciseid` int(10) unsigned NOT NULL,
`score` int(10) unsigned NOT NULL,
`attempted_time` datetime NOT NULL,
KEY `member_id` (`member_id`),
KEY `exercise_id` (`exercise_id`),
KEY `attempted_time_id` (`attempted_time`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

The table does not have any UNIQUE or PRIMARY KEY and I want to partition this table from the available partition types.
What could be best way for this type of table? Please help!