The grocery list effect

I'm planning to do only Quantum CAT, LSAT CR and RC and OG RC for some time, till the mid of  June. I would also improve on the areas I'm not so good at. Probability, Geometry, Inequalities and Overlapping Sets. Then, I would start with MGMAT books. I want to increase my speed and accuracy in Quant and also my speed with verbal. I'm sure I'll forget things if I start with MGMAT right away. Also, I have my courses in Calculus and Maths to complete by June mid. So to balance both tasks, I will concentrate on Quantum CAT now and MGMAT after June 20th.