Privates Ahmed, Daniel, Nadia, Stuart, Shell and Victor will be put on the chopping block for eviction this Friday. Jason and Michelle, the two sergeants, were successful in enforcing the tasks and motivating the privates, and so are spared eviction.
Ahmed is 4/7 favourite to go after annoying housemates all week by attempting to stage a military coup and failing to participate in tasks.
Ladbrokes spokesman Warren Lush said: "Ahmed has sealed his own fate in recent days and we would be astounded if he doesn't walk on Friday night. He tried to stage his own coup in the house and now viewers are going to stage their own coup and decisively overthrow him."
He added: "Bookmakers love to see a big eviction field but can only see votes against jungle cat Victor as an alternative to voting for Ahmed."
The housemates up for eviction are even more annoyed because they worked so hard on the task and unwittingly put themselves up for eviction in the process.
The task they completed was judged to be by far the hardest yet seen on 'Big Brother'.
The Boot Camp task, which began on Saturday morning and finished at 1pm today, saw the housemates perform a daily flag ceremony, exercise drill and sentry duty from 10pm to 6am. Other assignments included peeling 500 potatoes, polishing 200 pairs of muddy boots and painting coal white -- all within a limited time frame.
On top of this, the privates had to eat rations from a billycan while they cooked luxury food for the sergeants, Michelle and Jason, who ate at a plush dining table with bone china.
The housemates received two fails on Saturday, three on Sunday and one on Monday but, because they were allowed no more than three a day, they passed.
After Ahmed on 66/1, bodybuilder Jason is the least favourite contestant in the house to win 'Big Brother' with abysmal odds of 50/1 to win. If the privates had failed the task this week, there is no doubt that Jason would be evicted, because Michelle's popularity has soared recently, putting her at 4/1 to win the competition.
"At 66/1 Ahmed is the biggest price he has been to win, we completely write off his chances. The one to watch is Michelle, her odds have been cut from 6/1 to 4/1 and she leapfrogs her chicken Stu in the pecking order," Lush said.
Ladbrokes odds: Who will go?
1/3 Ahmed
3/1 Victor
14/1 Shell
20/1 Nadia
25/1 Dan
25/1 Stuart
Who will win?
2/1 Nadia
3/1 Daniel
4/1 Michelle
5/1 Stuart
8/1 Shell
9/1 Victor
25/1 Jason
66/1 Ahmed
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