Si tuviera más tiempo, editaría todos mis apuntes como si fueran un libro de ejercicios.

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Breakdown of Si tuviera más tiempo, editaría todos mis apuntes como si fueran un libro de ejercicios.

• tener: to have
• un: a
• ser: to be

Questions & Answers about Si tuviera más tiempo, editaría todos mis apuntes como si fueran un libro de ejercicios.

Why is it si tuviera and not si tengo or si tendría?

Because this is an unreal / hypothetical condition in the present or future.

• In Spanish, for unreal situations like “If I had more time, I would…”, the standard pattern is:
  si + imperfect subjunctive + conditional

So:

• Si tuviera más tiempo, editaría…
  = If I had more time, I would edit… (but I don’t have it)

Using si tengo would mean a real, possible condition:

• Si tengo tiempo, editaré / edito mis apuntes.
  = If I have time, I’ll edit / I edit my notes. (real possibility)

Si tendría is almost always considered incorrect in standard Spanish in this type of sentence. Native speakers normally avoid si + conditional in this structure.

What tense and mood are tuviera and fueran, exactly?

Both tuviera and fueran are in the imperfect subjunctive (also called past subjunctive):

• tuviera: imperfect subjunctive of tener
• fueran: imperfect subjunctive of ser

They are used because:

1. Si tuviera más tiempo…
   The si-clause expresses an unreal or hypothetical condition → imperfect subjunctive.

2. …como si fueran un libro de ejercicios.
   Como si almost always triggers the subjunctive because it introduces a comparison with something that is not real (your notes are not actually a workbook).

So the sentence uses the imperfect subjunctive twice, for two different hypothetical ideas.