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I'm in the process of assembling drilling materials.

Is the PowerScore Logical Reasoning Type Training I (1-20) book sufficient for drilling LR? The second series is out of print and thus crazy expensive on Amazon. Type Training I is basically every LR question from PTs 1-20 assembled by type.

Should I try to make my own drilling packet for the material from PTs 20-40?

If you sign up for blueprints online materials you can make Practice sets that target specific skills at adjustable difficulties.