The plan will involve up to 40 schools, and will focus on raising the quality of teaching through sharing expertise with successful schools.
First Minister Carwyn Jones said: "If we’re to raise standards and performance in education in Wales across the board we need to boost attainment levels of schools which are underperforming and we know could do better. The significant funding we’ve announced today is going to make a huge difference to those schools chosen to take on Schools Challenge Cymru."
The Always Active Uniform is a flexible, comfortable school uniform including active footwear, designed to support spontaneous movement and daily activity throughout the school day.
The Welsh Government has agreed to continue a licensing deal which will give all learners at Welsh state schools free access to Microsoft 365 at school and at home.
Schools will play a greater role in ensuring every pupil has a clear post-16 destination, with a new approach to a guaranteed college or FE provider place available as a safety net being tested.
New data from Ofqual shows that schools and colleges across England are making progress in cyber security training, but are struggling to recover quickly from attacks when they occur.