All topics in the Chem 1 Series Prerequisite page are important to lab and you should review those. Here is a selection of the skills most heavily relied upon in Chem 1L.
Appropriate use of Numbers:
Significant Figures (EP7)
Study Guide and Practice Problem Google Doc
Reference Handout with Listed Rules and Calculator Usage notes
Scientific Notation (EP5)
Study Guide and Practice Problem Google Doc
Scientific Notation and Using Calculators: Important Notes.
Units
Derived units (EP4)
Study Guide and Practice Problem Google Doc
Metric Conversion (EP6)
Study Guide and Practice Problem Google Doc
Solution Calculations and Concentrations
Molarity
Study Guide and Practice Problem Google Doc
Dilution
Study Guide and Practice Problem Google Doc
Other units of solution concentration:
Study Guide and Practice Problem Google Doc
Reaction Calculations
Reaction Stoichiometry
Study Guide and Practice Problem Google Doc
Percent Yield
Study Guide and Practice Problem Google Doc
Limiting Reagents
Study Guide and Practice Problem Google Doc