Ojalá mañana tenga la cabeza lo suficientemente despejada como para no quedarme en blanco y pasar del notable al sobresaliente.

Because ojalá expresses a wish or hope, and Spanish normally uses the subjunctive after it.

In this sentence:

• Ojalá mañana tenga... = Hopefully tomorrow I have... / I hope tomorrow I have...

A few useful patterns:

• Ojalá + present subjunctive → a wish about the present or future
  
  • Ojalá venga mañana.
• Ojalá + imperfect subjunctive → a more unlikely or hypothetical wish
  
  • Ojalá viniera mañana.
• Ojalá + hubiera / hubiese + past participle → a wish about the past
  
  • Ojalá hubiera venido.

So tenga is there because the speaker is hoping for something tomorrow.

Because the sentence is not just stating a future fact. It is expressing a hope about the future.

Compare:

• Mañana tendré la cabeza despejada.
  = Tomorrow I’ll have a clear head.
  This sounds like a straightforward statement or prediction.

• Ojalá mañana tenga la cabeza despejada.
  = Hopefully tomorrow I’ll have a clear head.
  This expresses desire/uncertainty, so Spanish uses the subjunctive.

So mañana points to the future, but ojalá controls the mood.

It is an idiomatic way to say that your mind is clear, focused, or not foggy.

• la cabeza = literally the head
• despejada = clear, unclouded

So tener la cabeza despejada means something like:

• to have a clear head
• to be mentally sharp
• to be able to think clearly

It is very natural in Spanish.

Because despejada agrees with la cabeza, which is feminine singular.

• la cabeza → feminine singular
• therefore → despejada

Agreement in Spanish works like this:

• el cuarto despejado
• la mente despejada
• los cielos despejados
• las ideas despejadas

Even though the person speaking may be male or female, despejada is describing cabeza, not the speaker.

This is a very common structure meaning enough ... to ...

In the sentence:

• lo suficientemente despejada como para no quedarme en blanco

This means:

• clear-headed enough not to go blank

Structure:

• lo suficientemente + adjective/adverb + como para + infinitive

Examples:

• Es lo suficientemente alto como para tocar el techo.
  = He’s tall enough to touch the ceiling.
• Habla lo suficientemente despacio como para que lo entienda.
  = He speaks slowly enough for me to understand him.

So here, the speaker wants their head to be clear enough to avoid the next problem.

Here, lo is part of the fixed intensifying structure lo suficientemente + adjective/adverb.

It does not mean it here.

Think of it as part of the pattern:

• lo suficientemente grande = big enough
• lo suficientemente rápido = fast enough
• lo suficientemente despejada = clear enough

It helps turn the adjective into the idea of being sufficiently X.

It is an idiom meaning:

• to go blank
• to have your mind suddenly go empty
• to forget everything in the moment

Very common in situations like:

• exams
• presentations
• interviews
• speaking in public

Examples:

• En el examen me quedé en blanco.
  = I went blank in the exam.
• Cuando me preguntaron, me quedé en blanco.
  = When they asked me, my mind went blank.

So in this sentence, the speaker hopes not to mentally freeze.

Because the idiom is quedarse en blanco, a pronominal expression.

• quedarse en blanco = to go blank

The me matches the subject:

• no quedarme en blanco = for me not to go blank

Other forms:

• quedarte en blanco = for you to go blank
• quedarse en blanco = to go blank
• me quedé en blanco = I went blank
• se quedó en blanco = he/she went blank

So the reflexive pronoun is part of the normal expression, not optional.

Because after para in the structure como para, Spanish normally uses the infinitive when the subject is the same.

Here the subject throughout is the speaker, so Spanish uses:

• como para no quedarme en blanco

Compare:

• Estoy demasiado cansado para salir.
  = I’m too tired to go out.
• No es lo suficientemente fácil como para hacerlo sin ayuda.
  = It isn’t easy enough to do it without help.

If the subject changes, Spanish often uses para que + subjunctive instead:

• Habla despacio para que lo entiendan.
  = He speaks slowly so that they understand him.

It means to move from a lower grade band to a higher one.

In Spain’s grading system:

• notable = roughly a strong grade, often around 7–8.9/10
• sobresaliente = an excellent grade, often around 9–10/10

So:

• pasar del notable al sobresaliente
  = to go from a very good mark to an excellent one

This sounds very natural in the context of exams, oral presentations, coursework, etc.

Because del is the contraction of de + el.

• de el notable → del notable
• a el sobresaliente → al sobresaliente

Spanish always contracts these two combinations:

• de + el = del
• a + el = al

So:

• pasar del notable al sobresaliente

means literally:

• to move from the notable to the sobresaliente

Here notable and sobresaliente are being treated as named grade categories.

It is figurative. Pasar de X a Y often means to go from X to Y, to progress from X to Y, or to move up from one level to another.

Examples:

• Pasó del miedo a la tranquilidad.
  = She went from fear to calm.
• Ha pasado de principiante a experto.
  = He has gone from beginner to expert.

So here it means improving one’s result, not physically going anywhere.

It can often correspond to either, depending on context.

• Ojalá apruebe.
  = Hopefully I pass. / I hope I pass.

A key difference is grammatical:

• English can say Hopefully...
• Spanish often uses Ojalá + subjunctive

Also, ojalá usually feels like a fairly strong wish. It is very common and natural.

A cultural/etymological note: ojalá comes from Arabic, originally meaning something like may God will it.

Yes, very naturally:

• Ojalá mañana tenga la cabeza
• lo suficientemente despejada
• como para no quedarme en blanco
• y pasar del notable al sobresaliente

That gives you this structure:

1. Wish: Ojalá mañana tenga...
2. Degree: lo suficientemente despejada
3. Result/goal: como para no quedarme en blanco
4. Further result: y pasar del notable al sobresaliente

This is a good way to read long Spanish sentences: identify the main wish first, then the degree phrase, then the purpose/result phrase.

Because mañana here is just a normal time expression integrated into the sentence:

• Ojalá mañana tenga...

A comma is not needed.

You might sometimes see commas used for emphasis in writing, but the neutral, standard version is without one.

Compare:

• Mañana voy al médico.
• Ojalá mañana salga todo bien.

Both are normally written without a comma.

Most of it is general Spanish, but notable and sobresaliente as grade labels strongly suggest Spain, because those terms are especially associated with the Spanish grading system.

The rest is widely understood across the Spanish-speaking world:

• ojalá
• tener la cabeza despejada
• quedarse en blanco
• lo suficientemente... como para...

So a learner of Spanish from Spain should definitely know this sentence as very natural.