Between 1st and 2nd Year:
This is a great time to review year one grammar as well as introduce yourself into newer aspects of more intermediate grammar.
A Graded Reader of Biblical Greek – William D. Mounce
This workbook from Bill Mounce works through numerous passages or chapters of Scripture by increasing level of difficulty. It also introduces you directly to more advanced grammar and vocabulary, simply by reading the text.
It's Still Greek to Me - David Alan Black
This provides a good introduction into and transition from first year Greek into more intermediate second year Greek.
Vocabulary:
Take this time and try to nail down the words you learned in year one.
Complete Vocabulary Guide to the Greek New Testament – Warren C. Trenchard
This is a great book which gives you literally everything you will ever need for vocabulary. Keep using the Vocabulary Cards but start incorporating this book as well.
Read Read Read:
At this time it is recommendable to read as much as you can of the GNT. Reading will help to cement the grammar and vocabulary that you learned in the first year, and at the same time introduce you to new vocabulary.
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