Almost all basic concepts required on GMAT Quant section are covered in the following videos.
Work Rates :
http://www.youtube.com/watch?v=Sc1MpH2bDv4
Union and Intersection of Sets :
http://www.youtube.com/watch?v=ktav02fitiQ
Sets :
http://www.youtube.com/watch?v=mgGiqsnb9xw
Motion :
http://www.youtube.com/watch?v=-lMTbML86l4
Geometry – Symmetry :
http://www.youtube.com/watch?v=lNGZbajRfaQ
Geometry – Spheres :
http://www.youtube.com/watch?v=HozOG8e0tD0
Geometry – Rectangular Solids :
http://www.youtube.com/watch?v=SJycga8V02M
Multiplying Decimals :
http://www.youtube.com/watch?v=GsL39QrqPKw
Intersecting Lines and Figures :
http://www.youtube.com/watch?v=iX1rDRKSVfA
Dividing Fractions :
http://www.youtube.com/watch?v=9fE6MCD_Lzk
Geometry – Diagonals :
http://www.youtube.com/watch?v=F5zDDgUs70k
Decimal or Percentage Expressions of Probability :
http://www.youtube.com/watch?v=PZ6TgH7UWbI
Geometry – Cylinders :
http://www.youtube.com/watch?v=tWHxuw9xQsU
Problem Solving - Circles :
http://www.youtube.com/watch?v=51P-ww1bils
Adding and Subtracting Decimals :
http://www.youtube.com/watch?v=IavJlscG60w
Square Roots :
http://www.youtube.com/watch?v=d0ScfdcfJxU
Permutations vs. Combinations :
http://www.youtube.com/watch?v=MbzqmEH4SlA
Solving Simultaneous Equations using Substitution :
http://www.youtube.com/watch?v=qx1vkRVpbPY
Solving Linear Equations with One Variable :
http://www.youtube.com/watch?v=CKLU_LrRKHs
Slope of a Line :
http://www.youtube.com/watch?v=q6qLOsFhZv4
Negative Bases :
http://www.youtube.com/watch?v=PhfMHo3JTRo
Fractional Exponents :
http://www.youtube.com/watch?v=hvEJrp9UzQo
Variables :
http://www.youtube.com/watch?v=229MTmwxwXc
Percents in the Answer Choices :
http://www.youtube.com/watch?v=02jCcEchlBs
The Data Sufficiency Question Type :
http://www.youtube.com/watch?v=Puo6Ja9HBG8
Number Properties :
http://www.youtube.com/watch?v=3FrJfs59kHM
Calculation vs. Conceptualization :
http://www.youtube.com/watch?v=XA3MYXP31_s
Combining Statements in Data Sufficiency :
http://www.youtube.com/watch?v=5-a0eZpoO5o
More on Picking Numbers :
http://www.youtube.com/watch?v=sHaLGB5ytVo
Strategic Guessing: Elimination :
http://www.youtube.com/watch?v=h4psEqWOOTQ
Fractions and Decimals :
http://www.youtube.com/watch?v=1pJ-g9MUewc
Equations :
http://www.youtube.com/watch?v=qIFZ4fOQ8Q4
Circles :
http://www.youtube.com/watch?v=CuGbgZIekKA
Inequalities :
http://www.youtube.com/watch?v=t9E7c25C-w4
Quadratic Equations :
http://www.youtube.com/watch?v=FmFJG8JeQkk
Probability :
http://www.youtube.com/watch?v=aWlekctXiZ8
Rates and Speed - Converting Rates :
http://www.youtube.com/watch?v=5lW-1fWSgws
Geometry - Multiple Figures :
http://www.youtube.com/watch?v=td15KTZrngg
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