Biblical Greek: A Compact Guide, Second Edition by William D. Mounce is a handy, at-a-glance reference for students, pastors, and teachers.
It follows the organization and format of the fourth edition of Basics of Biblical Greek Grammar, but it's also usable by students who learned with a different grammar. By limiting its discussion to the "nuts and bolts," Greek language students working on translation and exegesis will more quickly and easily find the relevant grammatical refreshers. Students can, for example, check on the range of meaning for a particular word or make sure they remember how aorist participles function in a sentence.
The paradigms, word lists, and basic discussions in Biblical Greek: A Compact Guide, Second Edition points students in the right direction and allow them to focus on more advanced Greek study.