Well in a way, yes you are wasting your time at this point because the traditional types will not come up in the consortium CEM exams. However, at least 4 or 5 of the types are vocabulary-based and would have been of some help : so dont feel they were a complete a waste of time. Unless of course, you are applying for Handsworth Boys or are planning the Indie exams in January.
Either way, don't bother with it for now and concentrate on the synonyms and antonyms. Try the www.freerice.com
website and you can google lists too. Also, have a look at the words from previous years listed in the sticky post at the top of forum.
If you are in Birmingham then it seems that the synonyms and antonyms will not be multiple choice this year but will have missing letters from the second word (see your sample sheet). So spelling is important too : if this is a weakness then it might be late to do a crash course in spelling but at least remind your child to sound out the syllables when they are spelling.
And of course, if it doesn't fit the gaps then then it is the CHILD who has the wrong word/spelling not 'the stupid paper' that put the wrong number of gaps ( although I think that might just only be my DS who reacts like that