Hello,
If the fever has been for no more than 3 days, no need to use both the medications. Use PCM/ Crocin syrup that you have, can give 8mL SOS (whenever fever >100F) upto maximum of 4 times a day with minimum gap of 6hrs, if after giving the medication fever doesn't starts coming down in next 2-3 hrs you can cold sponge the whole body of the child except for the chest area, that would suffice at the moment.
Next Steps
Keep looking for any danger signs like vomiting, letharginess, abnormal body movement or if the fever is for more than 3 days consult individually to a doctor and get some investigations done.