I am not a KS1 expert, but was assisted by one in writing this. It appears that new tests will be published each year from now on.
There will be two tests, each with a recommended duration of approximately 30 minutes (not strictly timed). The first will be a combined reading and answer paper, which will be part-read to children. The second will be completed independently and will be of higher challenge. Between 60% and 90% of marks will be awarded for comprehension, with up to 30% awarded for inference, and up to 10% awarded for understanding ‘language for effect’.
The outline of the papers is included in this table from the specification:
The final total score (out of 40) will be converted to a scaled score, with an indicator of whether or not the child has met the expected requirements.
As with KS2, there will be a separate arithmetic paper which tests calculation skills out of context. This will contain 15 one-mark questions. A second paper, worth 35 marks, will test fluency, reasoning and problem-solving. This is expected to last around 35 minutes, and can be taken with a break.
The final total score (out of 50) will be converted to a scaled score, with an indicator of whether or not the child has met the expected requirements. The content of the tests is indicated in this table drawn from the specification:
Grammar, Punctuation and Spelling
In line with requirements at KS2, all children in KS1 will be required to take a Grammar and Punctuation test, as well as a Spelling test. The Grammar and Punctuation assessment will consist of two parts. The first will be a short writing task based on a prompt, which can be assessed for various features including handwriting. This task is expected to take around 20 minutes.
The second will be a test requiring short answers, focussing on grammar, punctuation and vocabulary. This test will be taken in two parts, lasting approximately 10 minutes each with an optional break between. Finally, there will be a Spelling test of 20 words, which will take approximately 15 minutes.
The content of the papers is broken down here, in a table taken from the specification:
More detail on the test frameworks is available from the DfE website: