From left: go 彳, raise/grow up 育 (The new born baby [= child 子, but upside down, because at birth with head first] has a body 月, that needs to be raised.), strike 攵 (hand 又 with stick ノ)
Mnemonic
Go, grow up and if you can strike, you will get through it all.
The radical nobun shows a hand or 又 that holds a stick ノ (simplified from the Chinese radical 66 攴 for whip or rap. In this radical, the stick 卜 in the hand 又 is easily cognizable.)
Tip: Go to the radicals that are contained in this character and learn all the characters with this radical systematically!
Vocabulary
徹する
てっする
to sink in, to penetrate, to devote oneself, to believe in, to go through
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