I am facing a problem on the techniques trainer section. I have recruited another user so I have access to the 2nd sets of problems in each of the 3 levels (Basic, Intermediate, Advanced). In 'Double Integrals' section, I got one problem wrong (giving 3 times wrong answer) on the advanced level and I am having access to the second set of advanced level double Integral problems. But having the same situation reagarding the 'Evaluate Algebraic Expressions' section, I do not have access to the 2nd set of advanced level 'Evaluate Algebraic Expressions' problem, the link is still grey and while I move the mouse pointer over that, it says that "Finish previous sets to enable." I wonder that I have already finished the previous set (right answers to 2 problems and 3 wrong answers to the other problem).(I want to add that I have access to the 2nd sets of problems in different sections where I have solved the 1st sets of problems except the advanced level "Evaluate Algebraic Expressions" problems.) How can I have access to the 2nd set of advanced level "Evaluate Algebraic Expressions" problems? Will I ever have or not? Please help.