Hypnosis for Intellectual Performance: attention, concentration, focus, memory

It does not increase raw memory capacity, but it lifts what gets in its way: stress, which blocks retrieval (the famous exam blank), attentional scattering which sabotages encoding, and a lack of confidence in one's memory.
By restoring calm and focus, the memory you have becomes fully usable again. With students it is often spectacular.

Yes, because it is almost never a loss of capacity but a saturation: notifications, multitasking and background stress have trained your brain to hop around.
What was trained can be retrained: anchoring a focus state, a bubble of calm, switching rituals, and gradually weaning off the phone reflex. Expect a few weeks of practice for clear results.

Yes, and it is our most well-worn format: two or three closely spaced sessions to install calm you can call up on the day, the anti-blank protocol and mental rehearsal of the exam, without forgetting revision-period sleep.
You carry on revising the content; we prepare the form. With equal knowledge, form is what decides.

Only alongside, never instead. Diagnosis and follow-up of ADHD belong to the doctor or the neuropsychologist, and that matters.
With their agreement, hypnosis can help with what surrounds the difficulty: stress, self-esteem often scratched by years of "you are not applying yourself", sleep, routines. Be wary of anyone claiming to "treat" ADHD with hypnosis.

Almost never. Procrastination is an avoidance: you are fleeing the discomfort of starting, the fear of doing it badly (perfectionism is its first fuel) or a task that has become a mountain.
That is why willpower loses every evening: you do not reason with an automatic avoidance, you reprogramme it, by defusing what the task triggers and installing the first-few-minutes reflex.

No, and be wary of anyone offering it. The research is clear: "memory recovery" under hypnosis can manufacture false memories, sincerely believed but inaccurate, with sometimes serious consequences. We do not practise this kind of work.
Our work on memory is about something else: access to what you know (exams, work) and encoding of what you are learning.

Because an oral adds the gaze: under observation, your attention leaves the content to monitor the impression you are making, and stress closes access to your knowledge. It is mechanical, not a lack of level.
That switch can be reprogrammed: mental rehearsal of the oral in real conditions (panel included), an anchor of calm, and attention brought back to what you are saying rather than to what people are thinking.

Three things, generally:
switching rituals (a brain with no commute and no office needs new signals to enter and leave work), the focus bubble (resisting domestic and digital demands), and fragmentation (relearning long stretches without hopping around).
It is a retraining: a few weeks of practice with the self-hypnosis learned in session.

For your doctor first, and we say so kindly: any memory complaint that is unusual or getting worse deserves to be explored medically, without brushing it off or dramatising it.
If the assessment is reassuring, then yes: stress, sleep and lack of confidence weigh on memory at any age, and that can be worked on very well.

For a specific deadline (exam, competitive selection, oral): two or three closely spaced sessions.
For deeper retraining (concentration, procrastination): three to six sessions, with self-hypnosis practice between meetings, because focus is a daily training, not a switch. Self-sufficiency is always the aim.