Reddit reviews Plain-English Study Guide for the General Radiotelephone Operator License (GROL)
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These would be a good start:
GROL+Radar https://www.amazon.com/dp/0945053606/ref=cm_sw_r_cp_apa_CgirzbRG9608Q
Avionics Training: Systems, Installation, and Troubleshooting https://www.amazon.com/dp/1885544219/ref=cm_sw_r_cp_apa_Giirzb62JVYSC
Plain-English Study Guide for the General Radiotelephone Operator License (GROL) https://www.amazon.com/dp/B00BJ9X8AA/ref=cm_sw_r_cp_apa_jjirzbHP0JBY6
GROL Plus: General Radiotelephone Operator License Plus Radar Endorsement https://www.amazon.com/dp/0945053142/ref=cm_sw_r_cp_apa_Mjirzb020BB3W
Shop around for these or check with libraries.