i m 27 right now i have done my BE in ENTC in year 2006-07. but i have full experience in sales and marketing. but now i want to come in

I m 27 right now. I have done my BE in electronics and telecommunication in 2006-07 pass-out.but i have3.5 year full experience in sales and marketing.Now i want to come in my field so that can u suggest me which software course is beneficial for me. i have thinking that SAP or Software testing.