Case
Unit Assessments

My 1st graders are required to take unit assessments in which data has to be reported to the district. I find these assessment to be very lengthy and complex for 1st graders' developmental levels. Would you all suggest administering parts of the assessment in multiple days to not overwhelm the students?

Solution #1
First off, make sure you are following the system's guidelines for administering the unit assessments. If possible, breaking the assessments into smaller parts would no doubt be less overwhelming for the students. Also, if you feel like the assessments are not appropriate, I would have that conversation with someone in your system. It could be that they just don't realize it.

i like this solution so the student doesn't get overwhelmed

Solution #2
Students at that age may definitely get overwhelmed when seeing a large amount of testing material. I would definitely suggest breaking the test up. You would need to get that approved in advanced by an administrator before breaking up the test.
Solution #3
Testing can be overwhelming for students at any age. One method that I use for my 5th grade reading students is having them practice taking these longer assessments throughout the unit. I improve students reading stamina by constantly lengthening their assessments so they become more comfortable with them. Throughout the unit we build. They may begin with 1 passage and 10 questions in the beginning of the year. This gradually increasing and when the unit test comes I administer it on different days.
Solution #4
If you feel that the assessment is too lengthy to be appropriate for your first grade students, I would break up the assessment, but only if you are permitted to do so. If it is a unit assessment created by the district, there may be a policy that prohibits you from doing so. If there are district expectations on how the test is expected to be administered and you have concerns, I would contact your administration or the district to voice your concerns.
Solution #5
I would recommend spacing it out so they have time to comprehend the content.
Solution #6
I would first speak to the second grade teachers and see what is expected of students on assessments for them. Ideally, you want to prepare your students for the rigor of the next grade level. However, it may be beneficial to your young learners if you begin by administering the test in parts so they can adjust to it and eventually build them towards completing the assessment all at once.