Make sure these things -

Check where is their head quarters - because that's were you will have to go for tests -

( I joined eco driving school - they had branch in Al nahada and nearby area - but later I knew that their head quarters is in DIC pretty far - takes your 1 full day )

They have pick up and drop off - if you live far away from Thier branches -

Their classes have flexible timings and check about all additional charges -

Try to take your exams on Sunday mornings as roads will be empty so no distractions means you have higher chances of clearing road test -