Student or Learner
Is it ok to say "By 6 am lots of guys used to come at my previous gym", can we also use in my previous gym?
Note that you can use "okay" (lower case) or "OK" (upper case) but not "ok". Also note that we don't leave a space between a digit and "am" or "pm". It's "6am".
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.