You say these papers are not increasing confidence due to confusion. Where is the confusion?
1] fortress and fountain are synonyms of fort and font
2] Clock,watch, timer, view, see
We have to find 3 words that are related in the best way, this could be words that mean the same OR are related in someway. clock, timer and watch are related because they can be used to measure time. These 3 go together better than watch, view, see.
3] exact and right are synonyms of each other.
Tests will always use vocabulary that are very close in meaning/relation, its to make the child think. If the answers were obvious, there would be no challenge, the tests would not be differentiating between the weaker and stronger candidates.
The Tutors Papers are of a good quality, [vocab is slightly easier than the real test and Bright Sparks ]
What papers have you been using?