Here are some links to help keep your brains active and so you are ready for a really great start in year 4:
Maths:
http://www.topmarks.co.uk/maths-games/7-11-years/times-tables
http://www.arcademics.com/games/grand-prix/grand-prix.html
http://resources.woodlands-junior.kent.sch.uk/maths/wordproblems/y4matha.html
English:
http://www.funbrain.com/cgi-bin/sc.cgi
http://www.topmarks.co.uk/english-games/7-11-years/spelling-and-grammar