Are vanilla spells with cost > 300 impossible to cast?

[skywyze]

The absolute maximum spell points you can get is 300 (Sorcerer, 100 Int). But roughly 70% of all spells in the vanilla game cost more than 300 spell points. Does that mean > 70% of all spells are impossible to cast? If so, what purpose do they even serve?

[SeaGtGruff]

I have almost no experience playing a spellcaster in Arena, so I don't know all the details of how spellcasting works-- but is it similar to some of the later TES games where you can temporarily boost your magicka level by one method or other, which temporarily allows you to cast spells which you otherwise wouldn't have enough magicka to cast?

[AKB]

You can buy any spell regardless of whether you have enough spell points to cast it. The casting cost in spell points of the spell is cost divided by two divided by your level. For example, if you are tenth level, and Pitfalls spell costs 1200 golds, to cast Pitfalls costs 1200 / 2 / 10 = 60 spell points. Alternatively, use cost information from table below, where it represents the cost to buy the spell divided by 2. So now the casting cost in spell points of the spell is cost information from table below divided by your level. For example, if you are tenth level, and cost information from table below about Pitfalls spell equals 600, to cast Pitfalls costs 600 / 10 = 60 spell points.

[skywyze]

Wow, I thought I'd searched everywhere and couldn't find the answer. Thanks so much AKB!