questions :what courses to take

Hello,i am a 20 year construction worker 10 year machinist ,most my life i have worked around math somewhat, now im older and i want to go farther in knowledge and a job that i can progress further in but most of the things i know how to do that relates to an engineering feild requires math lots an lots of math an i dont even know how to add subtract divide or multiply fractions ..since i was a machinist for 10 years i used to use the machinist drill decimal chart to convert fractions to decimal ...did this by memory so that got me around fractions...kinda well anyhow i do alot of rigging of extremely heavy items [heaviest was 100000 tons] and i work on cars an clocks an carpentry pretty much anything to do with design or mechanics or mechanical ill have my hands in it..so i figured engineering till i found out i need math real math so what i am asking is what courses should i take that relates to my interests where would be a good school to start,thanks for reading this guys an gals happy holidays to you an yours and god bless ...Dave