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Why is もし added? What does it mean? Is it the same as in when you answer the phone?
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In the first clause, the small つ is in the wrong place.
もし、勉強しなかったら、
And, the second clause is not wrong but doesn't sound natural. Since you're talking about a "possible future outcome, " it would sound better if you use ~くなる・~になる.
せいせき が よくなくなる かも しれないよ。
Is this too hard to say? Then, use the adjective わるい instead of よい. How about this?
せいせき が わるくなる かも しれないよ
Also, when you want to ask if your example is correct, you can use a noun れい or たとえ in place of たとえば. たとえばis an adverb which means "for example."
Hope this helps!
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私のたとえばはただしいですか Is my example correct?
’もし、勉強しなっかたら、せいせきがよくないかもしれないよ!If you do not study, your grades will be bad!