Back in 2000 Blunkett had produced a list of 600 words which he wanted every 11-year-old to learn. Quite a few were from different subjec areas, but 150 were for spelling:
General spelling list
accommodation actually alcohol although analyse/analysis argument assessment atmosphere audible audience autumn beautiful beginning believe beneath buried business caught chocolate climb column concentration conclusion conscience conscious consequence continuous creation daughter decide/decision definite design development diamond diary disappear disappoint embarrass energy engagement enquire environment evaluation evidence explanation February fierce forty fulfil furthermore guard happened health height imaginary improvise industrial interesting interrupt issue jealous knowledge listening lonely lovely marriage material meanwhile miscellaneous mischief modern moreover murmur necessary nervous original outrageous parallel participation pattern peaceful people performance permanent persuade/persuasion physical possession potential preparation prioritise process proportion proposition questionnaire queue reaction receive reference relief remember research resources safety Saturday secondary separate sequence shoulder sincerely skilful soldier stomach straight strategy strength success surely surprise survey technique technology texture tomorrow unfortunately Wednesday weight weird women
Common homophones and confusions advise/advice a lot of affect/effect allowed/aloud braking/breaking bought/brought choose/chose cloth/clothe conscience/conscious course/coarse our/are practise/practice quiet/quite sites/sights source/sauce thank you threw/through to/too/two
I am sure there is overlap between the two, but I have no time to check for that now.