My step test was two three minute sessions with a minute break between.
The grip test: get a set of hand grips (two grips held together by a tight spring -looks like a letter V); do chin-ups with palms facing away from you (careful at first, you can strain yourself easily if you get too excited about it); sit so your legs are ben 90 degrees (i.e at the end f your bed), place your forearm on your arm so your palm faces up, place your hand so yo can bend it back at the wrist, using a a weight slowly curl your hand up to your forearm.
That worked for me.