WordPress database error: [Table './smDJtGH6wTJK5t/wp1f_actionscheduler_actions' is marked as crashed and last (automatic?) repair failed] SELECT a.hook FROM wp1f_actionscheduler_actions a
JOIN wp1f_actionscheduler_groups g ON g.group_id = a.group_id
WHERE g.slug = 'wp_mail_smtp' AND a.status IN ('in-progress', 'pending')
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WordPress database error: [Table './smDJtGH6wTJK5t/wp1f_actionscheduler_actions' is marked as crashed and last (automatic?) repair failed]
INSERT INTO wp1f_actionscheduler_actions ( `hook`, `status`, `scheduled_date_gmt`, `scheduled_date_local`, `schedule`, `group_id`, `priority`, `args` )
SELECT 'wp_mail_smtp_summary_report_email', 'pending', '2026-05-25 11:00:00', '2026-05-25 14:00:00', 'O:32:\"ActionScheduler_IntervalSchedule\":5:{s:22:\"\0*\0scheduled_timestamp\";i:1779706800;s:18:\"\0*\0first_timestamp\";i:1779706800;s:13:\"\0*\0recurrence\";i:604800;s:49:\"\0ActionScheduler_IntervalSchedule\0start_timestamp\";i:1779706800;s:53:\"\0ActionScheduler_IntervalSchedule\0interval_in_seconds\";i:604800;}', 13, 10, '[null]' FROM DUAL
WHERE (
SELECT action_id FROM wp1f_actionscheduler_actions
WHERE status IN ( 'pending', 'in-progress' )
AND hook = 'wp_mail_smtp_summary_report_email'
AND `group_id` = 13
LIMIT 1 ) IS NULL
WordPress database error: [Table './smDJtGH6wTJK5t/wp1f_actionscheduler_actions' is marked as crashed and last (automatic?) repair failed] SELECT a.action_id FROM wp1f_actionscheduler_actions a WHERE 1=1 AND a.hook='wp_mail_smtp_admin_notifications_update' AND a.status IN ('in-progress', 'pending') LIMIT 0, 1
WordPress database error: [Table './smDJtGH6wTJK5t/wp1f_actionscheduler_actions' is marked as crashed and last (automatic?) repair failed]
INSERT INTO wp1f_actionscheduler_actions ( `hook`, `status`, `scheduled_date_gmt`, `scheduled_date_local`, `schedule`, `group_id`, `priority`, `args` )
SELECT 'wp_mail_smtp_admin_notifications_update', 'pending', '2026-05-24 07:18:44', '2026-05-24 10:18:44', 'O:32:\"ActionScheduler_IntervalSchedule\":5:{s:22:\"\0*\0scheduled_timestamp\";i:1779607124;s:18:\"\0*\0first_timestamp\";i:1779607124;s:13:\"\0*\0recurrence\";i:86400;s:49:\"\0ActionScheduler_IntervalSchedule\0start_timestamp\";i:1779607124;s:53:\"\0ActionScheduler_IntervalSchedule\0interval_in_seconds\";i:86400;}', 13, 10, '[null]' FROM DUAL
WHERE (
SELECT action_id FROM wp1f_actionscheduler_actions
WHERE status IN ( 'pending', 'in-progress' )
AND hook = 'wp_mail_smtp_admin_notifications_update'
AND `group_id` = 13
LIMIT 1 ) IS NULL
WordPress database error: [Table './smDJtGH6wTJK5t/wp1f_actionscheduler_actions' is marked as crashed and last (automatic?) repair failed] SELECT a.action_id FROM wp1f_actionscheduler_actions a LEFT JOIN wp1f_actionscheduler_groups g ON g.group_id=a.group_id WHERE 1=1 AND g.slug='aioseo' AND a.hook='aioseo_cache_prune' AND a.args='[]' AND a.status IN ('in-progress', 'pending') LIMIT 0, 1
WordPress database error: [Table './smDJtGH6wTJK5t/wp1f_actionscheduler_actions' is marked as crashed and last (automatic?) repair failed] SELECT a.action_id FROM wp1f_actionscheduler_actions a LEFT JOIN wp1f_actionscheduler_groups g ON g.group_id=a.group_id WHERE 1=1 AND g.slug='aioseo' AND a.hook='aioseo_cache_prune' AND a.args='[]' AND a.status IN ('in-progress', 'pending') LIMIT 0, 1
WordPress database error: [Table './smDJtGH6wTJK5t/wp1f_actionscheduler_actions' is marked as crashed and last (automatic?) repair failed]
INSERT INTO wp1f_actionscheduler_actions ( `hook`, `status`, `scheduled_date_gmt`, `scheduled_date_local`, `schedule`, `group_id`, `priority`, `args` )
SELECT 'aioseo_cache_prune', 'pending', '2026-05-24 07:17:44', '2026-05-24 10:17:44', 'O:32:\"ActionScheduler_IntervalSchedule\":5:{s:22:\"\0*\0scheduled_timestamp\";i:1779607064;s:18:\"\0*\0first_timestamp\";i:1779607064;s:13:\"\0*\0recurrence\";i:86400;s:49:\"\0ActionScheduler_IntervalSchedule\0start_timestamp\";i:1779607064;s:53:\"\0ActionScheduler_IntervalSchedule\0interval_in_seconds\";i:86400;}', 9, 10, '[]' FROM DUAL
WHERE ( SELECT NULL FROM DUAL ) IS NULL
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WordPress database error: [Table './smDJtGH6wTJK5t/wp1f_actionscheduler_actions' is marked as crashed and last (automatic?) repair failed] SELECT a.action_id FROM wp1f_actionscheduler_actions a LEFT JOIN wp1f_actionscheduler_groups g ON g.group_id=a.group_id WHERE 1=1 AND g.slug='aioseo' AND a.hook='aioseo_cache_prune' AND a.args='[]' AND a.status IN ('in-progress', 'pending') LIMIT 0, 1
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INSERT INTO wp1f_actionscheduler_actions ( `hook`, `status`, `scheduled_date_gmt`, `scheduled_date_local`, `schedule`, `group_id`, `priority`, `args` )
SELECT 'aioseo_cache_prune', 'pending', '2026-05-24 07:17:44', '2026-05-24 10:17:44', 'O:32:\"ActionScheduler_IntervalSchedule\":5:{s:22:\"\0*\0scheduled_timestamp\";i:1779607064;s:18:\"\0*\0first_timestamp\";i:1779607064;s:13:\"\0*\0recurrence\";i:86400;s:49:\"\0ActionScheduler_IntervalSchedule\0start_timestamp\";i:1779607064;s:53:\"\0ActionScheduler_IntervalSchedule\0interval_in_seconds\";i:86400;}', 9, 10, '[]' FROM DUAL
WHERE ( SELECT NULL FROM DUAL ) IS NULL
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WordPress database error: [Table './smDJtGH6wTJK5t/wp1f_actionscheduler_actions' is marked as crashed and last (automatic?) repair failed]
INSERT INTO wp1f_actionscheduler_actions ( `hook`, `status`, `scheduled_date_gmt`, `scheduled_date_local`, `schedule`, `group_id`, `priority`, `args` )
SELECT 'woocommerce_ac_send_email_action', 'pending', '2026-05-24 07:18:45', '2026-05-24 10:18:45', 'O:32:\"ActionScheduler_IntervalSchedule\":5:{s:22:\"\0*\0scheduled_timestamp\";i:1779607125;s:18:\"\0*\0first_timestamp\";i:1779607125;s:13:\"\0*\0recurrence\";i:900;s:49:\"\0ActionScheduler_IntervalSchedule\0start_timestamp\";i:1779607125;s:53:\"\0ActionScheduler_IntervalSchedule\0interval_in_seconds\";i:900;}', 10, 10, '[]' FROM DUAL
WHERE ( SELECT NULL FROM DUAL ) IS NULL
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Cambridge IGCSE® & O Level Essential Chemistry: Student Book Third Edition
KSh4,440.00
In stock
By (author) Roger Norris
The Cambridge IGCSE (R) & O Level Essential Chemistry Student Book is at the heart of delivering the course and provides a clear, step-by-step route though the syllabus that is ideal for EAL learners. It has been fully updated and matched to the latest Cambridge IGCSE (0620) & O Level (5070) Chemistry syllabuses.
The book uses an engaging and exam-focused approach that is accessible to all abilities, with varied and flexible assessment support and exam-style questions that improve students’ performance and ensure every learner reaches their full potential. It combines depth of subject matter and clarity of material with concise, well-presented content, and includes embedded language for EAL students.
The Student Book is written by Roger Norris, a Cambridge examiner and experienced author of our previous Essential Chemistry Student Book and Workbook. It has also been reviewed by subject experts globally to help meet teachers’ needs.
The Student Book is available in print, online or via a great-value print and online pack. The supporting Exam Success Guide and Practical Workbook help students achieve top marks in their exams, while the Workbook, for independent practice, strengthens exam potential inside and outside the classroom.
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