Cristiano Ronaldo believes Real Madrid can win the treble this season after taking another step toward Champions League glory by beating Schalke.  The Spanish giants beat the Germans 3-1 last night in the second leg of the last 16 tie, which took them through 9-2 on aggregate after winning the first leg 6-1. Ronaldo scored two goals against the Bundesliga outfit taking his tally to 13 in this season’s competition and the attacker believes his side can win every tournament they are in this season.  I see the team doing well at the moment and, one step at a time, we will try to achieve our objective of winning three competitions, he told Uefa. com. “We know that will be difficult but at Madrid, we have to aim high. With that attitude, anything is possible. “Real take on Barcelona this weekend in El Clasico with Ronaldo’s side looking to stretch their lead at the top of La Liga. Real are three points clear of cross town rivals Atletico Madrid and are four ahead of Barca. Real face their bitter Catalan enemies in the Copa del Rey final in April as well.