Yes. We were trained for about 4 days prior to RMO last year. But since NTSE was our main goal for the year we didn't prepare much for it. RMO will depend on how interested you are in the subject. Do not do RMO as a compulsion. If clearing RMO is your goal and you are passionate towards the subject and towards clearing the exam, then I suggest you go full fledged towards it. But if that is not the case, the RMO prep will prove as a distraction to JEE prep.