More than 13,000 children will take a new form of the 11-plus from today, which education chiefs hope will limit the advantages of private coaching.

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Kent County Council has introduced changes to the test in an attempt to create a more level playing field between those who can afford private tutoring and those that cannot.

In other changes, the tests are to be taken in a single day for the first time.

Children will take the similar Medway Test - Medway's version of the exam - in schools across the Medway Towns from next Tuesday.

Education chiefs have acknowledged the new exam is unlikely to be completely tutor-proof and there are signs the change in format has not led to a drop in business for private coaching.

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Adam Taylor, who runs The Classrom, a tutoring company based in Thanet, said: "There has actually been an increase with parents seeming to fear other schools in their area.

"We are taking applications [for tuition] from all ages, even parents of children in reception classes."

Fees for the company range from £60 a term for help in one subject to £110 a term for help with maths and English.

Cllr Roger Gough (Con) said it would only be possible to judge the impact of the test over time.

"This year, we have had a very high level of applications for the test and over the last couple of years, we have seen the number of applications from children on free school meals [an indicator of poverty] go up.

"The aim is to ensure there is less scope for coaching the test although I never like to say the exam is tutor-proof."

The exam consists of two tests - one assessing reasoning ability and a second assessing literacy and numeracy.

In addition, there will a writing test under exam conditions. This will be used by head teacher panels in borderline cases.