Please could anyone kindly let me know what assessment grade TA1
Means.
My DD in year 10 recently received her end of term assessment, where the targeted grade, estimated grade & assessment grade was given , I remain unsure of the assessment grade .

Assessment grade = what she got in an assessment?

The Target grade being what she should get in the GCSE and the Estimated grade being what she is likely to get, given her current level.

Is this SHSG, btw? You might do better posting in Essex. Not all schools use exactly the same terminology.

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Outside of a dog, a book is a man's best friend. Inside of a dog it's too dark to read.Groucho Marx

I suggest you ask the school.