Many students smuggled in textbooks and notes into the examination centres despite tight security - and parents and friends were photographed scaling the walls of test centres to pass on answers to students during the current secondary school examinations.
The examinations, held by the Bihar School Examination Board (BSEB), began on Tuesday and are scheduled to go on until 24 March. Officials say more than 1.4 million students are taking the tests.
Most of the incidents of cheating this year have been reported from Saharsa, Chhapra, Vaishali and Hajipur districts.
Local newspapers have been full of photos of parents and relatives trying to help their children cheat even at considerable risk to their own lives, BBC Hindi's Manish Saandilya reports from the state capital, Patna.
Some photos even show policemen posted outside the centres accepting bribes to look the other way, our correspondent adds.
Photojournalist Dipankar, who took the photos in Saharsa district, says when he went into the examination hall and began taking pictures, the students did not seem worried at all.
Despite the many reports that have appeared in the local newspapers, the authorities seem uninterested in taking any action against the students, he says.
Dipankar says during a raid at just one school on Wednesday, the authorities seized sheets containing answers which filled up nine sacks.
Nearly 20 parents were detained briefly for trying to help their children cheat, but they were let go after a warning, he adds.
At some schools, like this one in Saran in Chhapra district, parents also clashed with the police.
Those caught cheating can be barred from taking an examination for up to three years, they can also be jailed or ordered to pay a fine, but punishment in such cases has rarely been reported in Bihar.
Education officials say they are committed to holding free, fair and peaceful examinations, and that examination centres are being filmed and special "flying squads" of officials are making surprise visits to the centres.
They say at least 400 students who have been caught cheating have been expelled.
But they say the government alone cannot stop cheating without help from students and parents.
"What can the government do to stop cheating if parents and relatives are not ready to cooperate? Should the government give orders to shoot them?" the Times of India quoted Bihar Education Minister PK Shahi as saying.

Connor Hamer, 22, said he had been refused service at the restaurant in Pilsworth on Sunday and would be protesting until the matter was sorted.
The firm said it "respected his right to protest" but the drive-thru was "for roadworthy motor vehicles only".
"To me a horse is like a car, I use them in everyday life," Mr Hammer said.
"I will be staying on McDonald's car park until it is sorted out," he added.
"It could take six days, it could take six months it doesn't matter, I won't be going nowhere."
He said he had lived in a horse-drawn vehicle for three years.

The 58-year-old, who has slipped to 100 in the world rankings, failed to make a half-century break at Ponds Forge.
China's Ding Junhui defeated Ireland's Greg Casey 10-4, while compatriot Liang Wenbo beat England's Joe O'Connor 10-2.
There are three rounds of qualifying, with 16 qualifiers joining the world's top 16 at the Crucible from 16 April.
Davis' last appearance at the Crucible showpiece came in 2010, when he produced a surprise run to the quarter-finals before being beaten by eventual champion Neil Robertson.
Ding, an 11-time ranking event winner, is playing the qualifiers for the first time since 2007 after a disappointing season that has seen him drop out of the top 16.
Two-time Crucible finalist Ali Carter is also through to the next stage of qualifying.

The pages from a 13th Century text of the holy book of Islam were purchased by the council in 1951.
Conservator Richard Hawkes said: "This is the earliest example of paper that I have worked on."
Leeds City Council said the paper's age and origin were confirmed by the Victoria and Albert Museum in 2014.
The pages mainly show surahs (or chapters) 29 and 30, said the council.
Councillor Brian Selby said: "The painstaking work of the museum team has ensured the pages can be displayed in a way which fully captures their significance as well as how ornate and beautiful they are."
Leeds City Museum's display starts on Saturday and is to run for a year.
Cheating in exams is fairly common in the Indian state of Bihar, but new images have emerged which show just how large-scale and blatant the practice is.
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A man is protesting outside a McDonald's after staff refused to serve him at the drive-thru on a horse and cart.
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Six-time champion Steve Davis failed to reach the World Championship as he lost 10-4 to Fergal O'Brien in the first round of qualifying in Sheffield.
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Two pages from an 800-year-old copy of the Koran decorated with gold leaf are to go on show in a Leeds museum display looking at Islam.