What was Nikola Tesla's educational background?

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Nikola completed "Lower" or "Primary" School, followed by the

"Lower Real Gymnasium" or "Normal School" and moved to the Higher

Real Gymnasium. He had a match teacher there named Martin Sekulić

who was an influence to Tesla. He was able to do calculus in his

head and some teachers believed that he was cheating but later came

to the right conclusion. After that education Tesla went back home

a bad case of cholera struck almost to his death. He ran away to

Tomingaj, near Gračac evanding the draft into the Austro-Hungarian

Army in Smiljan. He was lucky to join the Austrian Polytechnic in

Graz, Austria, on a Military Frontier scholarship after that and

graduated there.