How I Passed CompTIA CySA+ CS0-003

I recently passed the CompTIA CySA+ CS0-003 exam with a score of 768.

I studied for around two months, usually about 30 minutes a day, Monday to Friday.

I did not have years of cybersecurity engineering experience, so my strategy was simple: learn one topic, practice it, review what I got wrong, and repeat until the weak areas became familiar.

What the exam is like

The exam gives you up to 85 questions in 165 minutes, including multiple-choice questions and PBQs.

In my case, I had 7 PBQs first and then 56 multiple-choice questions. Your exam can be different.

The PBQs took me around 1 hour and 15 minutes, so my biggest advice is: do not panic if they take longer than expected.

Topics I recommend studying

• CVSS, CVE, EPSS, KEV, CPE, CWE
• Vulnerability scanning — credentialed vs non-credentialed, active vs passive
• Penetration testing — scan finds weaknesses, pen test proves exploitability
• SAST, DAST, IAST
• Web attacks — XSS, SQL injection, CSRF, SSRF, XXE, LFI, RFI, directory traversal, RCE
• MITRE ATT&CK, Diamond Model, Cyber Kill Chain
• Nmap and how to read scan output
• Windows Event IDs like 4624, 4625, 4672, 4720
• NTP for log time synchronization
• Malware analysis and sandboxing
• Threat intelligence — STIX, TAXII, OSINT, HUMINT, SIGINT, GEOINT
• SCAP — especially XCCDF and OVAL
• Kerberos, LDAP, SAML, OAuth, OpenID Connect
• Zero Trust — Policy Engine, Policy Administrator, Policy Enforcement Point
• SDN, NFV, SASE, segmentation
• Containers, VMs, IaaS, PaaS, SaaS
• TPM, Secure Boot, HSM, PKI
• DLP
• Risk responses — accept, mitigate, transfer, avoid
• POA&M vs Risk Register
• RTO, RPO, SLA, SLO
• Security controls — preventive, detective, corrective, recovery, compensating, directive, deterrent
• Incident response, tabletop exercises, lessons learned
• Digital forensics — RAM first, chain of custody, hashes, write blockers, order of volatility
• Reporting and compliance timelines
• Incident response — preparation, detection, containment, eradication, recovery, root cause analysis, lessons learned
• Incident response exercises — tabletop exercises, simulations, walkthroughs, communication and escalation
• Incident response metrics — MTTD, MTTC, MTTR
• Digital forensics — RAM first, chain of custody, hashes, write blockers, order of volatility, evidence preservation
• Reporting and compliance timelines — GDPR 72 hours, HIPAA 500+ within 60 days, applicable federal/CISA 1-hour scenarios
• NIST and evidence standards — SP 800-55, SP 800-61r3, SP 800-128, SP 800-218, RFC 3227
• Business continuity and recovery — RTO, RPO, SLA, SLO, backups and disaster recovery
• Security control types — preventive, detective, corrective, recovery, compensating, deterrent, directive
• Risk management — accept, mitigate, transfer, avoid, residual risk and compensating controls
• Security reporting — POA&M, risk registers, technical reports, executive reports and stakeholder communication
• Email security — SPF, DKIM, DMARC, phishing analysis, malicious links and attachments
• Attack and authentication techniques — password spraying, credential stuffing, brute force, pass-the-hash, pass-the-ticket, Kerberoasting, Golden Ticket, Silver Ticket
• Threat hunting and indicators — IOC vs IOA, beaconing, suspicious processes, persistence and lateral movement
• Data protection — DLP, data classification, encryption at rest and in transit
• Cryptography and PKI — AES, RSA, ECC, SHA-256, certificates, certificate authorities and digital signatures
• Security frameworks and standards — PCI DSS, CIS, OWASP, ISO and NIST
• Change and configuration management — security baselines, approvals, maintenance windows, rollback plans and configuration drift
• Automation and orchestration — SOAR, playbooks, APIs, webhooks and automated response
• OT and industrial systems — ICS, SCADA, operational technology security and segmentation

Reporting and compliance timelines

This is one area I had to memorize because the exam can ask which regulation applies and how quickly an incident must be reported.

• GDPR — for a qualifying personal-data breach, the supervisory authority should generally be notified without undue delay and, where feasible, within 72 hours after becoming aware.
• HIPAA — for a breach of unsecured PHI affecting 500 or more people, the HHS Secretary must be notified without unreasonable delay and no later than 60 days after discovery.
• HIPAA under 500 — these breaches are generally reported to HHS on an annual basis, subject to the applicable rules.
• U.S. civilian federal agency / CISA scenario — qualifying incidents can require notification to CISA within 1 hour of identification.

The important thing is to identify the framework first:

EU / personal data → GDPR → 72 hours
U.S. healthcare / HIPAA / 500+ → 60 days
U.S. civilian federal agency / CISA → 1 hour

Do not apply these numbers blindly. First identify the organization, jurisdiction, and regulation named in the question.

A few memory shortcuts that helped me

• CVSS = severity
• EPSS = probability of exploitation
• KEV = confirmed exploited vulnerability
• XSS = script in the browser
• CSRF = trick a logged-in user into sending a request
• SSRF = trick the server into making a request
• LFI = local file
• RFI = remote file
• Kerberos = tickets
• LDAP = directory
• SPF = authorized sender
• DKIM = signed email
• DMARC = what to do if SPF/DKIM fail

NIST / RFC numbers I memorized

• SP 800-55 — security measurements
• SP 800-61r3 — incident response
• SP 800-128 — configuration/baselines
• SP 800-218 — secure software development
• RFC 3227 — evidence collection / order of volatility

My memory chain was:

55 Measure → 61 Respond → 128 Configure → 218 Develop → 3227 Evidence

Mock exams I used

Practice Test 1 — 82% (70/85)

Practice Test 2 — 90% (76/85)

Practice Test 3 — 90% (76/85)

My progression was:

82% → study mistakes → 90% → study mistakes → 90%

AI prompt for studying CySA+

I am preparing for the CompTIA CySA+ exam.

Teach me one topic at a time and assume I am still learning cybersecurity.

After each lesson, quiz me with realistic CompTIA-style questions, including BEST, FIRST, NEXT, MOST likely, select-two, log-analysis and PBQ-style scenarios.

After I answer:
- grade me,
- explain my mistakes briefly,
- tell me whether I had a knowledge gap, confused similar concepts, or misunderstood the question,
- then give me new questions only on the topics I missed.

Track my weak areas and spend less time on topics I already know.

Include CVSS, EPSS, KEV, vulnerability scanning, web attacks, MITRE ATT&CK, Nmap, logs, malware, threat intelligence, SCAP, Kerberos, LDAP, SAML, OAuth, OIDC, Zero Trust, cloud, forensics, reporting, incident response, and reporting timelines such as GDPR, HIPAA, and applicable CISA/federal requirements.

Do not use exam dumps. Create original questions based on the official objectives.

As I improve, make the questions harder and more realistic.

Final advice

The strategy that worked for me was simple:

Learn → practice → review mistakes → study weak topics → retest.

I went from 82% → 90% → 90% on my mock exams and then passed the real test with 768.

You do not need a perfect score. You need to understand the material well enough to recognize what is happening in a scenario and choose the best action.

All the best, future cybersecurity engineer. ❤️