Birmingham jumped 21 places up a league table of LEAs for GCSE achievement to be ranked 50th nationally.
The jump - the biggest reported by the authority - saw 56.7 per cent of pupils gain five or more GCSEs graded between A* and C, compared to a national average of 57.1 per cent.
Coun Lawrence (Con Northfield) said: "Between 2002 and 2005 Birmingham was found to be the tenth most improved authority for GCSE results and reaching 56.7 per cent attainment at GCSE is testament to the hard work of staff and pupils at all secondary schools throughout the city."
Birmingham's achievement also justifies the authority's claim to be the best major city in the country to educate children.
Education chiefs in the city have, however, admitted part of the reason for the rise was greater use of the vocational GNVQ exam, which is to be scrapped next year.
The authority did, however, see an improvement on the proportion of youngsters gaining five or more good GCSEs, from 38 per cent in 2004 to 43 per cent last year.
Birmingham did less well for A level attainment, coming 75th nationally, but was ahead of Solihull, which was 99th.
The top place regionally for A level attainment was Shropshire and the bottom was Sandwell.
LEAs ranked on GCSE performance (proportion hitting benchmark target in brackets): Solihull (64.2), Shropshire (63.2), Warwickshire (57.3), Birmingham (56.7), Herefordshire (56.7), Worcestershire (55.7), Wolverhampton (55.1), Stafford-shire (54.5), Telford and Wrekin (53.9), Dudley (53.5), Stoke-on-Trent (48.1), Coventry (46.4), Walsall (46.2), Sandwell (43)