Please help me find 15 research studies from primary sources that address the question:
The impact of supplemental instruction on learning competence and academic performance. By: Hoi Kwan Ning; Downing, Kevin. Studies in Higher Education. Dec2010, Vol. 35 Issue 8, p921-939. 19p
THE EFFECT OF SUPPLEMENTAL INSTRUCTION ON TIMELY GRADUATION. By: Bowles, Tyler J.; McCoy, Adam C.; Bates, Scott. College Student Journal. Sep2008, Vol. 42 Issue 3, p853-859. 7p.
SUPPLEMENTAL INSTRUCTION IMPROVES GRADES BUT NOT PERSISTENCE. By: OJA, MICHELLE. College Student Journal. Jun2012, Vol. 46 Issue 2, p344-349. 6p
The Role of Supplemental Instruction in Success and Retention in Math Courses at a Hispanic-Serving Institution. By: Meling, Vanessa Bogran; Kupczynski, Lori; Mundy, Marie-Anne; Green, Mary E. Business Education Innovation ...
The effectiveness of extended learning time and instructions are examined. The extended learning time or supplemental instruction impact student achievement is discussed.