Mary, buy yourself a bag of Nestles chocolate chips, and follow the recipe for Toll House Cookies on the back. They are how I gauge and new oven I encounter, gas, electric or other. And they are pretty darned easy, and taste good no matter what the results look like. And you will have volunteers to help use up the proceeds no matter what. Follow the recipe, and put the first tray in to bake. Set your timer for 10 minutes, even though the bag says 12 ...
Check them at ten, see what they look like. If the middles still seem uncooked, but the dges are already dark, you know your oven is running too hot, just turn the temp down a bit. Put 'em back in. If they seem just not quite done - edges not very dark, middles still looking a tad undone, you oven is probably fine, and they'll be perfect at 12 minutes. If they are still not browning on the edges at 12 minutes, and seem to have spread out a LOT, you can leave them in a few more minutes, but that just means your oven isn't quite up to temperature ...
See, tollhouse cookies - yummy, and helpful as a diagnostic tool, too!

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