I keep a Google spreadsheet to keep track of assignments and student completion. For simple tasks, I just have a class list printed and cross off each name as it is completed.

For student progress, I keep this information and color code to keep track at a glance of who is struggling. I also photocopy unit tests of struggling students and have them correct mistakes or reteach concepts.

To keep track of assignments , they are input into an online grading system called Aspen. I also use checklists that have my students names and I can statements so that I can keep track of what they are learning.

Our district uses the platform Teacher Ease for grading, but our teachers use record sheets to collect data during instruction. We have standards based grading K-4, so record sheets allow us to drill down to the individual standard to collect data.
Here is an example of one of our record sheets.

https://docs.google.com/spreadsheets/d/1G6GEYJ_sfYWX-yMaRjgcLfk7Ugz22LGWJKwCsvO7Q7Q/edit?usp=sharing