im lvl 25 summoning how should i train it to lvl 40. and how could i do this in the cheapest way

Here's a link to a good summoning guide, which will be useful for you.

 

 

 

Just for 25 to 40, here's how you should use your charms.

 

Gold: Granite Crabs

 

Green: Compost Mounds, Beavers (at 33)

 

Crimson: SAVE THESE! Trust me, you'll want to train above 40 eventually, and you'll thank me later.

 

Blue: Same as crimsons.

thank you i will give it a try