BRISTOL'S mayor George Ferguson has congratulated the city's primary schools on their performance in this year's SATs results.Official exam results for primary school leavers reveal Bristol's academic performance has continued to improve, putting the city's achievements close to the national average.The proportion of 10 and 11-year-old pupils achieving the expected standard – Level 4 – in both English and maths has risen to 78 per cent, just below the national average of 79 per...