Have a wonderful summer! To prevent the "summer slide", consider the rigorous Algebra through Calculus
The following links would help your students master the math contests:
Past UH Math Contests: https://mathcontest.uh.edu/
Past AMC 8, AMC 10, and AMC 12 Contests: https://artofproblemsolving.com/wiki/index.php/AMC_Problems_and_Solutions.
Math Olympiad: https://tinyurl.com/yjkktyf6
Math Olympiad: https://sites.google.com/view/bao-le/math-olympiad
MathCounts: https://artofproblemsolving.com/wiki/index.php/MATHCOUNTS.
Past MathCounts Competitions: https://www.mathcounts.org/resources/past-competitions.
Johns Hopkins Mathematics Competitions: https://math.jhu.edu/~mathclub/jhmt.html
All Texas Mathematics Competitions: https://artofproblemsolving.com/wiki/index.php/Texas_mathematics_competitions